Cisco Secure Firewall Threat Defense Remote Access VPN Web Server DoS (cisco-sa-asaftd-vpnwebs-dos-hjBhmBsX)

high Nessus Plugin ID 255229

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

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

- A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow a remote attacker that is authenticated as a VPN user to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header field value. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause a DoS condition, which would cause the affected device to reload. (CVE-2025-20244)

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 CSCwo08017

Plugin Details

Severity: High

ID: 255229

File Name: cisco-sa-asaftd-vpnwebs-dos-hjBhmBsX-ftd.nasl

Version: 1.1

Type: local

Family: CISCO

Published: 8/26/2025

Updated: 8/26/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2025-20244

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: cpe:/a:cisco:firepower_threat_defense

Required KB Items: installed_sw/Cisco Firepower Threat Defense

Exploit Ease: No known exploits are available

Patch Publication Date: 8/14/2025

Vulnerability Publication Date: 8/14/2025

Reference Information

CVE: CVE-2025-20244

CWE: 1287

CISCO-SA: cisco-sa-asaftd-vpnwebs-dos-hjBhmBsX

IAVA: 2025-A-0612

CISCO-BUG-ID: CSCwo08017

Detections

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