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Cisco NX-OS Improper Handling of Exceptional Conditions (CVE-2020-3338)

🗓️ 29 Nov 2024 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 9 Views

Vulnerability in Cisco NX-OS PIM6 allows denial of service due to improper error handling.

Related
Refs
Code
ReporterTitlePublishedViews
Family
bdu_fstec
BDU FSTEC		The vulnerability of the Protocol Independent Multicast (PIM) implementation in the Cisco NX-OS network operating system allows a attacker to trigger a service failure.
3 Sep 202000:00
–bdu_fstec
cisco
Cisco		Cisco NX-OS Software IPv6 Protocol Independent Multicast Denial of Service Vulnerability
26 Aug 202016:00
–cisco
nessus
Tenable Nessus		Cisco NX-OS Software IPv6 Protocol Independent Multicast DoS (cisco-sa-nxos-pim-memleak-dos-tC8eP7uw)
28 Aug 202000:00
–nessus
cnvd
CNVD		Cisco NX-OS Denial of Service Vulnerability (CNVD-2020-49933)
27 Aug 202000:00
–cnvd
cve
CVE		CVE-2020-3338
27 Aug 202015:40
–cve
cvelist
Cvelist		CVE-2020-3338 Cisco NX-OS Software IPv6 Protocol Independent Multicast Denial of Service Vulnerability
27 Aug 202015:40
–cvelist
euvd
EUVD		EUVD-2020-24609
7 Oct 202500:30
–euvd
ncsc
NCSC		Vulnerabilities fixed in Cisco products
27 Aug 202000:00
–ncsc
nvd
NVD		CVE-2020-3338
27 Aug 202016:15
–nvd
prion
Prion		Design/Logic Flaw
27 Aug 202016:15
–prion
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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  script_cve_id("CVE-2020-3338");

  script_name(english:"Cisco NX-OS Improper Handling of Exceptional Conditions (CVE-2020-3338)");

  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 Protocol Independent Multicast (PIM) feature
for IPv6 networks (PIM6) of Cisco NX-OS Software could allow an
unauthenticated, remote attacker to cause a denial of service (DoS)
condition on an affected device. The vulnerability is due to improper
error handling when processing inbound PIM6 packets. An attacker could
exploit this vulnerability by sending multiple crafted PIM6 packets to
an affected device. A successful exploit could allow the attacker to
cause the PIM6 application to leak system memory. Over time, this
memory leak could cause the PIM6 application to stop processing
legitimate PIM6 traffic, leading to a DoS condition on the affected
device.

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-pim-memleak-dos-tC8eP7uw
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?319c006d");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-pim-memleak-dos-tC8eP7uw
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?319c006d");
  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:U/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-2020-3338");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(404, 755);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/08/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/08/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/11/29");

  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) 2024-2025 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" :
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        {"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" :
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    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%283%29" :
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    "cpe:/o:cisco:nexus_3000_series_switches:6.0%282%29A8%286%29" :
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    "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" :
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    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29F3%283%29" :
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    "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" :
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    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29F3%283a%29" :
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    "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" :
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    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I4%281t%29" :
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    "cpe:/o:cisco:nexus_3000_series_switches:7.0%283%29I7%283z%29" :
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    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29IA7%282%29" :
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    "cpe:/o:cisco:nexus_9000_series_switches:9.2%282%29" :
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    "cpe:/o:cisco:nexus_9000_series_switches:7.0%283%29I7%287%29" :
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    "cpe:/o:cisco:nexus_3000_series_switches:9.3%282%29" :
        {"versionEndIncluding" : "9.3%282%29", "versionStartIncluding" : "9.3%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:9.3%282%29" :
        {"versionEndIncluding" : "9.3%282%29", "versionStartIncluding" : "9.3%282%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:8.2%285%29" :
        {"versionEndIncluding" : "8.2%285%29", "versionStartIncluding" : "8.2%285%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:7.3%285%29D1%281%29" :
        {"versionEndIncluding" : "7.3%285%29D1%281%29", "versionStartIncluding" : "7.3%285%29D1%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_7000_series_switches:7.3%282%29D1%281d%29" :
        {"versionEndIncluding" : "7.3%282%29D1%281d%29", "versionStartIncluding" : "7.3%282%29D1%281d%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_9000_series_switches:9.3%281z%29" :
        {"versionEndIncluding" : "9.3%281z%29", "versionStartIncluding" : "9.3%281z%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
7.5High risk
Vulners AI Score7.5
CVSS 25
CVSS 3.17.5
CVSS 37.5
EPSS0.01781
SSVC
cve-2020-3338cisco nx-osprotocol independent multicastipv6 networksdenial of servicememory leak.
9