Strix
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CVE-2026-20022

MEDIUMCVSS 6.5/10EPSS 0.19%

Last modified

CVE-2026-20022 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.19%

9.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software9.12.1
CiscoAdaptive Security Appliance Software9.12.1.2
CiscoAdaptive Security Appliance Software9.12.1.3
CiscoAdaptive Security Appliance Software9.12.2
CiscoAdaptive Security Appliance Software9.12.2.1
CiscoAdaptive Security Appliance Software9.12.2.4
CiscoAdaptive Security Appliance Software9.12.2.5
CiscoAdaptive Security Appliance Software9.12.2.9
CiscoAdaptive Security Appliance Software9.12.3
CiscoAdaptive Security Appliance Software9.12.3.2
CiscoAdaptive Security Appliance Software9.12.3.7
CiscoAdaptive Security Appliance Software9.12.3.9
CiscoAdaptive Security Appliance Software9.12.3.12
CiscoAdaptive Security Appliance Software9.12.4
CiscoAdaptive Security Appliance Software9.12.4.2
CiscoAdaptive Security Appliance Software9.12.4.4
CiscoAdaptive Security Appliance Software9.12.4.7
CiscoAdaptive Security Appliance Software9.12.4.8
CiscoAdaptive Security Appliance Software9.12.4.10
CiscoAdaptive Security Appliance Software9.12.4.13
CiscoAdaptive Security Appliance Software9.12.4.18
CiscoAdaptive Security Appliance Software9.12.4.24
CiscoAdaptive Security Appliance Software9.12.4.26
CiscoAdaptive Security Appliance Software9.12.4.29
CiscoAdaptive Security Appliance Software9.12.4.30
CiscoAdaptive Security Appliance Software9.12.4.35
CiscoAdaptive Security Appliance Software9.12.4.37
CiscoAdaptive Security Appliance Software9.12.4.38
CiscoAdaptive Security Appliance Software9.12.4.39
CiscoAdaptive Security Appliance Software9.12.4.40
CiscoAdaptive Security Appliance Software9.12.4.41
CiscoAdaptive Security Appliance Software9.12.4.47
CiscoAdaptive Security Appliance Software9.12.4.48
CiscoAdaptive Security Appliance Software9.12.4.50
CiscoAdaptive Security Appliance Software9.12.4.52
CiscoAdaptive Security Appliance Software9.12.4.54
CiscoAdaptive Security Appliance Software9.12.4.55
CiscoAdaptive Security Appliance Software9.12.4.56
CiscoAdaptive Security Appliance Software9.12.4.58
CiscoAdaptive Security Appliance Software9.12.4.62
CiscoAdaptive Security Appliance Software9.12.4.65
CiscoAdaptive Security Appliance Software9.12.4.67
CiscoAdaptive Security Appliance Software9.16.1
CiscoAdaptive Security Appliance Software9.16.1.28
CiscoAdaptive Security Appliance Software9.16.2
CiscoAdaptive Security Appliance Software9.16.2.3
CiscoAdaptive Security Appliance Software9.16.2.7
CiscoAdaptive Security Appliance Software9.16.2.11
CiscoAdaptive Security Appliance Software9.16.2.13
CiscoAdaptive Security Appliance Software9.16.2.14

Showing 50 of 239 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20022?
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.
How severe is CVE-2026-20022?
CVE-2026-20022 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20022?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20022?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST