Memory Corruption Vulnerability in Cisco Secure Firewall Products
CVE-2026-20023

6.1MEDIUM

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-2026-20023?

A potential memory corruption issue has been identified in the parsing of OSPF protocol packets on Cisco Secure Firewall Adaptive Security Appliance and Threat Defense Software. An attacker with adjacent access may exploit this flaw by sending specifically crafted OSPF packets, potentially leading to memory corruption. This can trigger a reboot of the affected device, thereby causing a denial of service condition. Organizations using these Cisco products should be aware of this vulnerability to ensure proper safeguarding measures are in place.

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:
6.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.