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CVE-2026-20022

Published: Mar 4, 2026Updated: May 4, 2026 Sources: CVE List NVDCWE-823
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.2%
Top 90.8%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:AAC:HPR:NUI:NS:CC:NI:NA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-823

Affected Products

Cisco Secure Firewall Adaptive Security Appliance (ASA) SoftwareCisco
EmbeddedOS
Networking Infrastructure / firewall
Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco
On-premSecurity Product
Security Products
adaptive security appliance softwarecisco
On-premNetwork Device
Networking Infrastructure / firewall
firepower threat defense softwarecisco
On-premSecurity Product
Security Products / vuln-mgmt-scanner
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospf-ZH8PhbSW
sec.cloudapps.cisco.com

Timeline

Published
Mar 4, 2026
Last Updated
May 4, 2026

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