How severe is CVE-2026-20022?

CVE-2026-20022 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-20022 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20022?

CVE-2026-20022 primarily affects Cisco Adaptive Security Appliance Software. In total, 239 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20022?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-20022 have an EU (EUVD) identifier?

Yes. CVE-2026-20022 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9479.

When was CVE-2026-20022 published?

CVE-2026-20022 was published on 2026-03-04 and last updated on 2026-06-17.

CVE-2026-20022

CVE-2026-20022 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-823.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9479
Weakness: CWE-823
Affected product: Cisco Adaptive Security Appliance Software
Published: 2026-03-04
Last modified: 2026-06-17

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.

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 3.x base score of 6.1, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-20022 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20022?: CVE-2026-20022 primarily affects Cisco Adaptive Security Appliance Software. In total, 239 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20022?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20022 have an EU (EUVD) identifier?: Yes. CVE-2026-20022 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9479.
When was CVE-2026-20022 published?: CVE-2026-20022 was published on 2026-03-04 and last updated on 2026-06-17.

References

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

Affected products (239)

cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.13:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.18:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.24:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.26:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.29:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.30:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.35:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.37:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.38:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.39:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.40:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.41:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.47:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.48:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.50:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.52:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.54:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.55:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.56:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.58:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.62:*:*:*:*:*:*:*

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