Detections
Analytics

Cisco Adaptive Security Appliance (ASA) Remote Access SSL VPN DoS (cisco-sa-asaftd-vpn-dos-dzv4mQFF)

high Nessus Plugin ID 335417

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, the Cisco ASA software is affected by a denial of service vulnerability. A flaw exists due to insufficient error checking when processing HTTP requests. An unauthenticated, remote attacker can exploit this issue, via a crafted HTTP request to the Remote Access SSL VPN service, to cause the system to stop responding.

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwv96220

See Also

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwv96220

http://www.nessus.org/u?4fa90043

Plugin Details

Severity: High

ID: 335417

File Name: cisco-sa-asaftd-vpn-dos-dzv4mQFF-asa.nasl

Version: 1.2

Type: Combined

Family: CISCO

Published: 8/14/2026

Updated: 8/15/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.8

Percentile: 99.33

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.4

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

CVSS Score Source: CVE-2026-20349

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 8

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

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

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software

Required KB Items: Settings/ParanoidReport, Host/Cisco/ASA

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/11/2026

Vulnerability Publication Date: 8/11/2026

CISA Known Exploited Vulnerability Due Dates: 8/14/2026

Reference Information

CVE: CVE-2026-20349

CWE: 244

CISCO-SA: cisco-sa-asaftd-vpn-dos-dzv4mQFF

IAVA: 2026-A-0850

CISCO-BUG-ID: CSCwv96220