Detections
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Multiple Cisco Products Snort 3 DoS Vulnerabilities (cisco-sa-snort3-misc-dos-6mB22qAK_CVE-2026-76489)

medium Nessus Plugin ID 369978

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco ASA Software is affected by a vulnerability.

 - Multiple Cisco products are affected by a vulnerability in the memory management implementation of Snort 3 that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 processes files, which could cause unreleased memory. An attacker could exploit this vulnerability by sending a large number of files to be processed. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.
 (CVE-2026-76489)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCwr25134, CSCwu23999, CSCwu51449, CSCwu51451, CSCwu53570

See Also

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwr25134

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwu23999

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwu51449

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwu51451

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwu53570

http://www.nessus.org/u?314b2fdb

Plugin Details

Severity: Medium

ID: 369978

File Name: cisco-sa-snort3-misc-dos-6mB22qAK_CVE-2026-76489-asa.nasl

Version: 1.1

Type: Local

Family: CISCO

Published: 10/21/2026

Updated: 10/21/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-76489

CVSS v3

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 5.1

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software

Required KB Items: Host/Cisco/ASA/model

Exploit Ease: No known exploits are available

Patch Publication Date: 10/21/2026

Vulnerability Publication Date: 10/21/2026

Reference Information

CVE: CVE-2026-76489