CVE-2026-20021 — Missing Release of Memory after Effective Lifetime in Cisco Secure Firewall Adaptive Security Appliance Software
CWE-401 — Missing Release of Memory after Effective LifetimeCWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-190 — Integer Overflow or WraparoundCWE-20 — Improper Input ValidationCWE-787 — Out-of-bounds WriteCWE-823 — Use of Out-of-range Pointer Offset4 documents4 sources
Severity
4.3MEDIUMNVD
EPSS
0.0%
top 94.08%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedMar 4
Description
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 devic…
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LExploitability: 2.8 | Impact: 1.4
Affected Packages2 packages
🔴Vulnerability Details
2CVEList▶
CVE-2026-20021: A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD↗2026-03-04
GHSA▶
GHSA-qjf3-5p7q-6r9m: A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD↗2026-03-04
📋Vendor Advisories
1Cisco▶
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software OSPF Protocol Vulnerabilities↗2026-03-04