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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0534
Denial of Service Vulnerability in Cisco product

Original Issue Date:November 02, 2026

Severity Rating: HIGH

Software Affected

  • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software version 9.16 and prior, 9.18, 9.20, 9.22, 9.23, 9.24
  • Cisco Secure Firewall Threat Defense (FTD) Software versions 7.0 and prior, 7.2, 7.4, 7.6, 7.7, 10.0, and 10.1

Overview

A vulnerability has been reported in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software which could allow a remote attacker to cause denial of service (DoS) conditions on the targeted system.
 
Target Audience:
All organizations and individuals using affected versions of Cisco Secure Firewall ASA and FTD Software.

Risk Assessment:
High risk of service disruption.

Impact Assessment:
Potential for High risk of denial of service (DoS) conditions.

Description

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software are security appliances used for firewall and VPN services.

This vulnerability exists in Cisco Secure Firewall ASA Software and Cisco Secure FTD Software due to logic errors when secondary authentication is configured on a tunnel group. A remote attacker could exploit these vulnerabilities by sending a specially crafted request when connecting to the SSL remote access VPN.

Successful exploitation of these vulnerabilities could allow an attacker to cause denial of service (DoS) conditions on the targeted system.

Solution

Apply appropriate security as mentioned in CISCO advisory:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75

Vendor Information

Cisco
https://www.cisco.com/

References

 
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75

CVE Name
CVE-2026-76418

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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