CVE-2026-20021A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, adjacent…
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It affects cisco adaptive_security_appliance_software and 1 other product. Add what you run to find out whether that includes you.
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A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, adjacent attacker to exhaust memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to improperly validating input by the OSPF protocol when parsing packets. An attacker could exploit this vulnerability by by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to exhaust memory on the affected device, resulting in a DoS condition.
- CVSS
- 4.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-401
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Aug 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cisco adaptive_security_appliance_software cisco:adaptive_security_appliance_software | from 9.12.1 through 9.12.4.67; from 9.16.1 through 9.16.4.85; from 9.17.1 through 9.17.1.46; from 9.18.1 through 9.18.4.68; from 9.19.1 through 9.19.1.42; from 9.20.1 through 9.20.4.14; from 9.22.1.1 through 9.22.2.14; from 9.23.1 through 9.23.1.22 | NVD |
cisco secure_firewall_threat_defense cisco:secure_firewall_threat_defense | 6.4.0; 6.4.0.1; 6.4.0.2; 6.4.0.3; 6.4.0.4; 6.4.0.5; 6.4.0.6; 6.4.0.7; and 68 more ranges | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospf-ZH8PhbSWvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.