Remote Access VPN Vulnerability in Cisco Secure Firewall Software
CVE-2026-20105

7.7HIGH

Key Information:

Vendor

Cisco
Status
Cisco Secure Firewall Adaptive Security Appliance (asa) Software
Cisco Secure Firewall Threat Defense (ftd) Software
Vendor
CVE Published:
4 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-20105?

A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software allows an authenticated, remote attacker with a valid VPN connection to exploit the system by sending specially crafted packets. This exploit can exhaust device memory, triggering a denial of service condition and causing the device to reload. The vulnerability arises from a lack of input validation, which allows attackers to manipulate the behavior of the VPN server and disrupt its normal operation.

Affected Version(s)

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.