PT-2026-22975 · Cisco · Cisco Secure Firewall Ftd+2

Published 2026-03-04 · Updated 2026-03-09 · CVE-2026-20039

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software (affected versions not specified)

Description A flaw exists in the VPN web server that could allow a remote, unauthenticated attacker to cause a denial of service (DoS) condition. This is due to ineffective memory management when handling HTTP requests. An attacker could exploit this by sending a large number of crafted HTTP requests, potentially causing the device to reload and become unavailable.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Weakness Enumeration

CWE-244

Related Identifiers

CVE-2026-20039

Affected Products

Cisco Asa

Cisco Secure Firewall Asa

Cisco Secure Firewall Ftd

References · 9

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20039 · Security Note
• https://twitter.com/AbedOmary/status/2030362400361271797 · Twitter Post
• https://twitter.com/CveFindCom/status/2029266351081083289 · Twitter Post
• https://t.me/CVEtracker/46329 · Telegram Post
• https://twitter.com/AbedOmary/status/2031113294501831061 · Twitter Post
• https://twitter.com/AbedOmary/status/2030362402861052037 · Twitter Post
• https://twitter.com/CVEnew/status/2029272812683141627 · Twitter Post
• https://twitter.com/TheHackerWire/status/2029270645033554214 · Twitter Post