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CVE-2026-20023

Published: Mar 4, 2026Updated: May 4, 2026 Sources: CVE List NVDCWE-787
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.2%
Top 95.3%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

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 unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to memory corruption when parsing OSPF protocol packets. An attacker could exploit this vulnerability by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to cause memory corruption causing the affected device to reboot, 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-787

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
firepower threat defense softwarecisco
On-premSecurity Product
Security Products / vuln-mgmt-scanner
adaptive security appliance softwarecisco
On-premNetwork Device
Networking Infrastructure / firewall
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

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

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

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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