Remote Access SSL VPN Vulnerability in Cisco Secure Firewall Products
CVE-2026-20103

8.6HIGH

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-2026-20103?

A vulnerability affecting the Remote Access SSL VPN functionality in Cisco's Secure Firewall ASA and FTD Software could enable an unauthenticated remote attacker to exploit device memory leading to a denial of service condition. This issue arises from insufficient validation of user inputs, allowing attackers to send specially crafted packets to the Remote Access SSL VPN server. Successful exploitation could result in the unavailability of VPN connections, causing interruptions while potentially leaving the management interface temporarily unresponsive.

Affected Version(s)

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.48

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.50

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.52

References

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

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.