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Cisco NX-OS Software MPLS OAM Denial of Service (CVE-2021-1588)

🗓️ 25 Jul 2023 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 22 Views

Cisco NX-OS Software MPLS OAM DoS vulnerabilit

Related
Refs
Code
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB		CVE-2021-1588
25 Aug 202116:00
–attackerkb
bdu_fstec
BDU FSTEC		The vulnerability of the MPLS Operation, Administration, and Maintenance (OAM) function of the Cisco NX-OS operating system allows a attacker to cause maintenance failures.
27 Oct 202100:00
–bdu_fstec
circl
Circl		CVE-2021-1588
3 Sep 202123:02
–circl
cisco
Cisco		Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability
25 Aug 202116:00
–cisco
nessus
Tenable Nessus		Cisco NX-OS Software MPLS OAM DoS (cisco-sa-nxos-mpls-oam-dos-sGO9x5GM)
11 Feb 202200:00
–nessus
cnnvd
CNNVD		Cisco NX-OS Software 缓冲区错误漏洞
25 Aug 202100:00
–cnnvd
cnvd
CNVD		Cisco NX-OS Software Denial of Service Vulnerability (CNVD-2021-68723)
26 Aug 202100:00
–cnvd
cve
CVE		CVE-2021-1588
25 Aug 202119:11
–cve
cvelist
Cvelist		CVE-2021-1588 Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability
25 Aug 202119:11
–cvelist
euvd
EUVD		EUVD-2021-7055
3 Oct 202520:07
–euvd
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(501394);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/16");

  script_cve_id("CVE-2021-1588");

  script_name(english:"Cisco NX-OS Software MPLS OAM Denial of Service (CVE-2021-1588)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability in the MPLS Operation, Administration, and Maintenance
(OAM) feature of Cisco NX-OS Software could allow an unauthenticated,
remote attacker to cause a denial of service (DoS) condition on an
affected device. This vulnerability is due to improper input
validation when an affected device is processing an MPLS echo-request
or echo-reply packet. An attacker could exploit this vulnerability by
sending malicious MPLS echo-request or echo-reply packets to an
interface that is enabled for MPLS forwarding on the affected device.
A successful exploit could allow the attacker to cause the MPLS OAM
process to crash and restart multiple times, causing the affected
device to reload and resulting in a DoS condition.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-mpls-oam-dos-sGO9x5GM
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?eb798f69");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-1588");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(125, 20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/08/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/07/25");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nexus_3000_series_switches");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nexus_7000_series_switches");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nexus_9000_series_switches");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2023-2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Cisco");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Cisco');

var asset = tenable_ot::assets::get(vendor:'Cisco');

var vuln_cpes = {
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%281%29" :
        {"versionEndIncluding" : "7.0%283%29I4%281%29", "versionStartIncluding" : "7.0%283%29I4%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%281%29" :
        {"versionEndIncluding" : "7.0%283%29I4%281%29", "versionStartIncluding" : "7.0%283%29I4%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%282%29" :
        {"versionEndIncluding" : "7.0%283%29I4%282%29", "versionStartIncluding" : "7.0%283%29I4%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%282%29" :
        {"versionEndIncluding" : "7.0%283%29I4%282%29", "versionStartIncluding" : "7.0%283%29I4%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%283%29" :
        {"versionEndIncluding" : "7.0%283%29I4%283%29", "versionStartIncluding" : "7.0%283%29I4%283%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%283%29" :
        {"versionEndIncluding" : "7.0%283%29I4%283%29", "versionStartIncluding" : "7.0%283%29I4%283%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.1%281%29" :
        {"versionEndIncluding" : "8.1%281%29", "versionStartIncluding" : "8.1%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.2%281%29" :
        {"versionEndIncluding" : "8.2%281%29", "versionStartIncluding" : "8.2%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:7.3%282%29D1%281%29" :
        {"versionEndIncluding" : "7.3%282%29D1%281%29", "versionStartIncluding" : "7.3%282%29D1%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:7.3%281%29D1%281%29" :
        {"versionEndIncluding" : "7.3%281%29D1%281%29", "versionStartIncluding" : "7.3%281%29D1%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:7.3%280%29DX%281%29" :
        {"versionEndIncluding" : "7.3%280%29DX%281%29", "versionStartIncluding" : "7.3%280%29DX%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:7.3%280%29D1%281%29" :
        {"versionEndIncluding" : "7.3%280%29D1%281%29", "versionStartIncluding" : "7.3%280%29D1%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%284%29" :
        {"versionEndIncluding" : "7.0%283%29I4%284%29", "versionStartIncluding" : "7.0%283%29I4%284%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%284%29" :
        {"versionEndIncluding" : "7.0%283%29I4%284%29", "versionStartIncluding" : "7.0%283%29I4%284%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%285%29" :
        {"versionEndIncluding" : "7.0%283%29I4%285%29", "versionStartIncluding" : "7.0%283%29I4%285%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%285%29" :
        {"versionEndIncluding" : "7.0%283%29I4%285%29", "versionStartIncluding" : "7.0%283%29I4%285%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%286%29" :
        {"versionEndIncluding" : "7.0%283%29I4%286%29", "versionStartIncluding" : "7.0%283%29I4%286%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%286%29" :
        {"versionEndIncluding" : "7.0%283%29I4%286%29", "versionStartIncluding" : "7.0%283%29I4%286%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%287%29" :
        {"versionEndIncluding" : "7.0%283%29I4%287%29", "versionStartIncluding" : "7.0%283%29I4%287%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%287%29" :
        {"versionEndIncluding" : "7.0%283%29I4%287%29", "versionStartIncluding" : "7.0%283%29I4%287%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I5%281%29" :
        {"versionEndIncluding" : "7.0%283%29I5%281%29", "versionStartIncluding" : "7.0%283%29I5%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I5%281%29" :
        {"versionEndIncluding" : "7.0%283%29I5%281%29", "versionStartIncluding" : "7.0%283%29I5%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I5%282%29" :
        {"versionEndIncluding" : "7.0%283%29I5%282%29", "versionStartIncluding" : "7.0%283%29I5%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I5%282%29" :
        {"versionEndIncluding" : "7.0%283%29I5%282%29", "versionStartIncluding" : "7.0%283%29I5%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I6%281%29" :
        {"versionEndIncluding" : "7.0%283%29I6%281%29", "versionStartIncluding" : "7.0%283%29I6%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I6%281%29" :
        {"versionEndIncluding" : "7.0%283%29I6%281%29", "versionStartIncluding" : "7.0%283%29I6%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I7%281%29" :
        {"versionEndIncluding" : "7.0%283%29I7%281%29", "versionStartIncluding" : "7.0%283%29I7%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I7%281%29" :
        {"versionEndIncluding" : "7.0%283%29I7%281%29", "versionStartIncluding" : "7.0%283%29I7%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:7.3%282%29D1%282%29" :
        {"versionEndIncluding" : "7.3%282%29D1%282%29", "versionStartIncluding" : "7.3%282%29D1%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.1%282%29" :
        {"versionEndIncluding" : "8.1%282%29", "versionStartIncluding" : "8.1%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.1%282a%29" :
        {"versionEndIncluding" : "8.1%282a%29", "versionStartIncluding" : "8.1%282a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.2%282%29" :
        {"versionEndIncluding" : "8.2%282%29", "versionStartIncluding" : "8.2%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I4%288%29" :
        {"versionEndIncluding" : "7.0%283%29I4%288%29", "versionStartIncluding" : "7.0%283%29I4%288%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%288%29" :
        {"versionEndIncluding" : "7.0%283%29I4%288%29", "versionStartIncluding" : "7.0%283%29I4%288%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I6%282%29" :
        {"versionEndIncluding" : "7.0%283%29I6%282%29", "versionStartIncluding" : "7.0%283%29I6%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I6%282%29" :
        {"versionEndIncluding" : "7.0%283%29I6%282%29", "versionStartIncluding" : "7.0%283%29I6%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I7%282%29" :
        {"versionEndIncluding" : "7.0%283%29I7%282%29", "versionStartIncluding" : "7.0%283%29I7%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I7%282%29" :
        {"versionEndIncluding" : "7.0%283%29I7%282%29", "versionStartIncluding" : "7.0%283%29I7%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I7%283%29" :
        {"versionEndIncluding" : "7.0%283%29I7%283%29", "versionStartIncluding" : "7.0%283%29I7%283%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I7%283%29" :
        {"versionEndIncluding" : "7.0%283%29I7%283%29", "versionStartIncluding" : "7.0%283%29I7%283%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%281%29" :
        {"versionEndIncluding" : "6.0%282%29A8%281%29", "versionStartIncluding" : "6.0%282%29A8%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%282%29" :
        {"versionEndIncluding" : "6.0%282%29A8%282%29", "versionStartIncluding" : "6.0%282%29A8%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%283%29" :
        {"versionEndIncluding" : "6.0%282%29A8%283%29", "versionStartIncluding" : "6.0%282%29A8%283%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%284%29" :
        {"versionEndIncluding" : "6.0%282%29A8%284%29", "versionStartIncluding" : "6.0%282%29A8%284%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%284a%29" :
        {"versionEndIncluding" : "6.0%282%29A8%284a%29", "versionStartIncluding" : "6.0%282%29A8%284a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%285%29" :
        {"versionEndIncluding" : "6.0%282%29A8%285%29", "versionStartIncluding" : "6.0%282%29A8%285%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%286%29" :
        {"versionEndIncluding" : "6.0%282%29A8%286%29", "versionStartIncluding" : "6.0%282%29A8%286%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%287%29" :
        {"versionEndIncluding" : "6.0%282%29A8%287%29", "versionStartIncluding" : "6.0%282%29A8%287%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%287a%29" :
        {"versionEndIncluding" : "6.0%282%29A8%287a%29", "versionStartIncluding" : "6.0%282%29A8%287a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%287b%29" :
        {"versionEndIncluding" : "6.0%282%29A8%287b%29", "versionStartIncluding" : "6.0%282%29A8%287b%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%288%29" :
        {"versionEndIncluding" : "6.0%282%29A8%288%29", "versionStartIncluding" : "6.0%282%29A8%288%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%289%29" :
        {"versionEndIncluding" : "6.0%282%29A8%289%29", "versionStartIncluding" : "6.0%282%29A8%289%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29F3%281%29" :
        {"versionEndIncluding" : "7.0%283%29F3%281%29", "versionStartIncluding" : "7.0%283%29F3%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29F3%281%29" :
        {"versionEndIncluding" : "7.0%283%29F3%281%29", "versionStartIncluding" : "7.0%283%29F3%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29F3%282%29" :
        {"versionEndIncluding" : "7.0%283%29F3%282%29", "versionStartIncluding" : "7.0%283%29F3%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29F3%283%29" :
        {"versionEndIncluding" : "7.0%283%29F3%283%29", "versionStartIncluding" : "7.0%283%29F3%283%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29F3%283%29" :
        {"versionEndIncluding" : "7.0%283%29F3%283%29", "versionStartIncluding" : "7.0%283%29F3%283%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29F3%283a%29" :
        {"versionEndIncluding" : "7.0%283%29F3%283a%29", "versionStartIncluding" : "7.0%283%29F3%283a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29F3%283a%29" :
        {"versionEndIncluding" : "7.0%283%29F3%283a%29", "versionStartIncluding" : "7.0%283%29F3%283a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29F3%284%29" :
        {"versionEndIncluding" : "7.0%283%29F3%284%29", "versionStartIncluding" : "7.0%283%29F3%284%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29F3%284%29" :
        {"versionEndIncluding" : "7.0%283%29F3%284%29", "versionStartIncluding" : "7.0%283%29F3%284%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29F3%283c%29" :
        {"versionEndIncluding" : "7.0%283%29F3%283c%29", "versionStartIncluding" : "7.0%283%29F3%283c%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29F3%283c%29" :
        {"versionEndIncluding" : "7.0%283%29F3%283c%29", "versionStartIncluding" : "7.0%283%29F3%283c%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I7%284%29" :
        {"versionEndIncluding" : "7.0%283%29I7%284%29", "versionStartIncluding" : "7.0%283%29I7%284%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I7%284%29" :
        {"versionEndIncluding" : "7.0%283%29I7%284%29", "versionStartIncluding" : "7.0%283%29I7%284%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:9.2%281%29" :
        {"versionEndIncluding" : "9.2%281%29", "versionStartIncluding" : "9.2%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:9.2%281%29" :
        {"versionEndIncluding" : "9.2%281%29", "versionStartIncluding" : "9.2%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.3%281%29" :
        {"versionEndIncluding" : "8.3%281%29", "versionStartIncluding" : "8.3%281%29", "family" : "NXOS"},
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    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I7%289w%29" :
        {"versionEndIncluding" : "7.0%283%29I7%289w%29", "versionStartIncluding" : "7.0%283%29I7%289w%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I7%289w%29" :
        {"versionEndIncluding" : "7.0%283%29I7%289w%29", "versionStartIncluding" : "7.0%283%29I7%289w%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.4%284a%29" :
        {"versionEndIncluding" : "8.4%284a%29", "versionStartIncluding" : "8.4%284a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_3000_series_switches:9.3%287a%29" :
        {"versionEndIncluding" : "9.3%287a%29", "versionStartIncluding" : "9.3%287a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:9.3%287a%29" :
        {"versionEndIncluding" : "9.3%287a%29", "versionStartIncluding" : "9.3%287a%29", "family" : "NXOS"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);

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16 Oct 2025 00:00Current
7.8High risk
Vulners AI Score7.8
CVSS 25
CVSS 3.18.6
EPSS0.01316
SSVC
cisconx-osmplsoamdenial of servicecve-2021-1588remote attackerinput validationecho-requestecho-replyinterfaceforwardingtenable.otscanner
22