Cisco Secure Firewall Threat Defense Software VPN Web Server Remote Code Execution (cisco-sa-asaftd-webvpn-z5xP8EUB)

critical Nessus Plugin ID 265943

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 VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device. (CVE-2025-20333)

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 CSCwq79831

Plugin Details

Severity: Critical

ID: 265943

File Name: cisco-sa-asaftd-webvpn-z5xP8EUB-ftd.nasl

Version: 1.2

Type: local

Family: CISCO

Published: 9/26/2025

Updated: 9/26/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7.4

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

CVSS Score Source: CVE-2025-20333

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 9.2

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

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

Vulnerability Information

CPE: cpe:/a:cisco:firepower_threat_defense

Required KB Items: installed_sw/Cisco Firepower Threat Defense

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/25/2025

Vulnerability Publication Date: 9/25/2025

CISA Known Exploited Vulnerability Due Dates: 9/26/2025

Reference Information

CVE: CVE-2025-20333

CISCO-SA: cisco-sa-asaftd-webvpn-z5xP8EUB

IAVA: 2025-A-0702

CISCO-BUG-ID: CSCwq79831

Detections

Analytics