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

high Tenable OT Security Plugin ID 506054

Synopsis

The remote OT asset is affected by a vulnerability.

Description

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.

Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 506054

File Name: tenable_ot_cisco_CVE-2024-20426.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 10/5/2026

Updated: 10/5/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.3

Percentile: 50.87

CVSS v3

Risk Factor: High

Base Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vulnerability Information

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

Required KB Items: Tenable.ot/Cisco

Patch Publication Date: 10/23/2024

Vulnerability Publication Date: 10/23/2024

Reference Information

CVE: CVE-2024-20426

CWE: 476

Detections

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