Heap Corruption Vulnerability in OSPF Protocol of Cisco Secure Firewall
CVE-2026-20024

6.8MEDIUM

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-2026-20024?

A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA and Cisco Secure FTD Software enables an authenticated, adjacent attacker to exploit heap corruption when parsing OSPF packets. By sending specially crafted packets to the OSPF service, the attacker can induce unexpected reboots of the affected devices, leading to a Denial-of-Service (DoS) condition. This vulnerability underscores the importance of securing OSPF configurations and monitoring network traffic for anomalies that could indicate an ongoing attack.

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:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.