kbrain

CVE-2026-20020

MEDIUM · CVSS 6.8EPSS 0.3%EU EUVD

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. If OSPF authentication is enabled, the attacker must know the secret key to exploit this vulnerability. This vulnerability is due to insufficient input validation when processing OSPF update packets. An attacker could exploit this vulnerability by sending crafted OSPF update packets. A successful exploit could allow the attacker to create a buffer overflow, causing the affected device to reload, resulting in a DoS condition.

Key facts

CVSS score
6.8 (v3.1)
Severity
MEDIUM
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness (CWE)
CWE-20
EPSS score
0.3% (17th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2026-9477)
Published
March 4, 2026
NVD last modified
August 11, 2026
Status
Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-9477 in the EU Vulnerability Database. Last updated in EUVD on March 4, 2026.

View on the EU Vulnerability Database

Affected products

  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software
  • cisco / adaptive security appliance software

and 171 more…

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain