Vulnerability in Cisco Adaptive Security Appliance Software
CVE-2026-20022
A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload unexpectedly, resulting in a DoS condition when OSPF canonicalization debug is enabled by using the command debug ip ospf canon. This vulnerability is due to insufficient input validation when processing OSPF LSU packets. An attacker could exploit this vulnerability by sending crafted unauthenticated OSPF packets. A successful exploit could allow the attacker to write to memory outside of the packet data, causing the device to reload, resulting in a DoS condition.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Cisco Adaptive Security Appliance Software — versions 9.12.1, 9.12.1.2, 9.12.1.3
- Cisco Secure Firewall Adaptive Security Appliance (Asa) Software — versions 9.12.1, 9.12.1.2, 9.12.1.3
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 6.4.0, 6.4.0.1, 6.4.0.3
- Cisco Firepower Threat Defense Software — versions 6.4.0, 6.4.0.1, 6.4.0.2
- Cisco Secure Firewall Threat Defense — versions 6.4.0, 6.4.0.1, 6.4.0.2
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20022?
- CVE-2026-20022 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under CWE-823. CVSS score: 6.1/10. Published 2026-03-04.
- How severe is CVE-2026-20022?
- Medium severity. CVSS v3 base score is 6.1 out of 10.