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Cisco ASA NULL Pointer Dereference (CVE-2024-20426)

🗓️ 05 Oct 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 4 Views

Unauthenticated remote DoS in Cisco ASA and FTD via crafted IKEv2 traffic.

Related
Refs
Code
ReporterTitlePublishedViews
Family
bdu_fstec
BDU FSTEC		The vulnerability of Microprogramming Software in Cisco Adaptive Security Appliances (ASA) and Cisco Firepower Threat Defense (FTD) relates to pointer arithmetic errors, which allow attackers to trigger service failures.
1 Nov 202400:00
–bdu_fstec
circl
Circl		CVE-2024-20426
23 Oct 202420:45
–circl
cisco
Cisco		Cisco Adaptive Security Appliance and Firepower Threat Defense Software IKEv2 VPN Denial of Service Vulnerability
23 Oct 202416:00
–cisco
cnnvd
CNNVD		Cisco Firepower Threat Defense和Cisco Adaptive Security Appliance 安全漏洞
23 Oct 202400:00
–cnnvd
cve
CVE		CVE-2024-20426
23 Oct 202417:46
–cve
cvelist
Cvelist		CVE-2024-20426
23 Oct 202417:46
–cvelist
euvd
EUVD		EUVD-2024-18141
3 Oct 202520:07
–euvd
ncsc
NCSC		Vulnerabilities fixed in Cisco Adaptive Security Appliance and Firepower Threat Defense
24 Oct 202408:37
–ncsc
nvd
NVD		CVE-2024-20426
23 Oct 202418:15
–nvd
osv
OSV		CVE-2024-20426
23 Oct 202418:15
–osv
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

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  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 Internet Key Exchange version 2 (IKEv2)
protocol for VPN termination of Cisco Adaptive Security Appliance
(ASA) Software and Cisco Firepower Threat Defense (FTD) Software could
allow an unauthenticated, remote attacker to cause a denial of service
(DoS) condition on an affected device. This vulnerability is due to
insufficient input validation. An attacker could exploit this
vulnerability by sending crafted IKEv2 traffic to an affected device.
A successful exploit could allow the attacker to cause the device to
reload, 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-9FgEyHsF
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?85d56eec");
  script_set_attribute(attribute:"solution", value:
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  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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-2024-20426");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(476);

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/10/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/10/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/05");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.1.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.2.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.2.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.2.8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.39");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.46");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.53");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.55");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.56");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.22");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.24");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.19.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.12");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.18");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.22");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.24");
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}


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:adaptive_security_appliance_software:9.18.1" :
        {"versionEndIncluding" : "9.18.1", "versionStartIncluding" : "9.18.1", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.1.3" :
        {"versionEndIncluding" : "9.18.1.3", "versionStartIncluding" : "9.18.1.3", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.2" :
        {"versionEndIncluding" : "9.18.2", "versionStartIncluding" : "9.18.2", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.2.5" :
        {"versionEndIncluding" : "9.18.2.5", "versionStartIncluding" : "9.18.2.5", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.2.7" :
        {"versionEndIncluding" : "9.18.2.7", "versionStartIncluding" : "9.18.2.7", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.2.8" :
        {"versionEndIncluding" : "9.18.2.8", "versionStartIncluding" : "9.18.2.8", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.3" :
        {"versionEndIncluding" : "9.18.3", "versionStartIncluding" : "9.18.3", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.39" :
        {"versionEndIncluding" : "9.18.3.39", "versionStartIncluding" : "9.18.3.39", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.46" :
        {"versionEndIncluding" : "9.18.3.46", "versionStartIncluding" : "9.18.3.46", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.53" :
        {"versionEndIncluding" : "9.18.3.53", "versionStartIncluding" : "9.18.3.53", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.55" :
        {"versionEndIncluding" : "9.18.3.55", "versionStartIncluding" : "9.18.3.55", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.3.56" :
        {"versionEndIncluding" : "9.18.3.56", "versionStartIncluding" : "9.18.3.56", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.4" :
        {"versionEndIncluding" : "9.18.4", "versionStartIncluding" : "9.18.4", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.5" :
        {"versionEndIncluding" : "9.18.4.5", "versionStartIncluding" : "9.18.4.5", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.8" :
        {"versionEndIncluding" : "9.18.4.8", "versionStartIncluding" : "9.18.4.8", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.22" :
        {"versionEndIncluding" : "9.18.4.22", "versionStartIncluding" : "9.18.4.22", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.24" :
        {"versionEndIncluding" : "9.18.4.24", "versionStartIncluding" : "9.18.4.24", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.18.4.29" :
        {"versionEndIncluding" : "9.18.4.29", "versionStartIncluding" : "9.18.4.29", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1" :
        {"versionEndIncluding" : "9.19.1", "versionStartIncluding" : "9.19.1", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.5" :
        {"versionEndIncluding" : "9.19.1.5", "versionStartIncluding" : "9.19.1.5", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.9" :
        {"versionEndIncluding" : "9.19.1.9", "versionStartIncluding" : "9.19.1.9", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.12" :
        {"versionEndIncluding" : "9.19.1.12", "versionStartIncluding" : "9.19.1.12", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.18" :
        {"versionEndIncluding" : "9.19.1.18", "versionStartIncluding" : "9.19.1.18", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.22" :
        {"versionEndIncluding" : "9.19.1.22", "versionStartIncluding" : "9.19.1.22", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.24" :
        {"versionEndIncluding" : "9.19.1.24", "versionStartIncluding" : "9.19.1.24", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.27" :
        {"versionEndIncluding" : "9.19.1.27", "versionStartIncluding" : "9.19.1.27", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.28" :
        {"versionEndIncluding" : "9.19.1.28", "versionStartIncluding" : "9.19.1.28", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.19.1.31" :
        {"versionEndIncluding" : "9.19.1.31", "versionStartIncluding" : "9.19.1.31", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.20.1" :
        {"versionEndIncluding" : "9.20.1", "versionStartIncluding" : "9.20.1", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.20.1.5" :
        {"versionEndIncluding" : "9.20.1.5", "versionStartIncluding" : "9.20.1.5", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.20.2" :
        {"versionEndIncluding" : "9.20.2", "versionStartIncluding" : "9.20.2", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.20.2.10" :
        {"versionEndIncluding" : "9.20.2.10", "versionStartIncluding" : "9.20.2.10", "family" : "CiscoFirepower"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.20.2.21" :
        {"versionEndIncluding" : "9.20.2.21", "versionStartIncluding" : "9.20.2.21", "family" : "CiscoFirepower"}
};

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

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06 Oct 2026 00:00Current
7.7High risk
Vulners AI Score7.7
CVSS 3.18.6
EPSS0.00518
SSVC
Cisco ASACisco Firepower Threat DefenseIKEv2denial of serviceinput validation
4