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.

Published: 2026-03-04 Last update: 2026-05-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-20022 is rated Low Risk (25.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-20022

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-05 — 0.01% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20022

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 4.0 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2026-20022

Affected software / configurations for CVE-2026-20022

Vendor Product Version Raw CPE
cisco adaptive_security_appliance_software 9.12.1 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.1.2 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1.2:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.1.3 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.1.3:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.2 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.2.1 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.1:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.2.4 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.4:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.2.5 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.5:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.2.9 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.2.9:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.3 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.3.2 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.2:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.3.7 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.7:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.3.9 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.9:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.3.12 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.3.12:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.2 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.2:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.4 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.4:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.7 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.7:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.8 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.8:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.10 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.10:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.13 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.13:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.18 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.18:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.24 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.24:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.26 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.26:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.29 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.29:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.30 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.30:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.35 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.35:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.37 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.37:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.38 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.38:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.39 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.39:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.40 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.40:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.41 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.41:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.47 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.47:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.48 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.48:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.50 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.50:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.52 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.52:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.54 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.54:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.55 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.55:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.56 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.56:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.58 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.58:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.62 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.62:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.65 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.65:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.12.4.67 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.67:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.1 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.1:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.1.28 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.1.28:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.2 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.2.3 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.3:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.2.7 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.7:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.2.11 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.11:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.2.13 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.13:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.2.14 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.14:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.3 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.3.3 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.3:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.3.14 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.14:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.3.15 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.15:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.3.19 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.19:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.3.23 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.23:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.9 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.9:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.14 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.14:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.19 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.19:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.27 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.27:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.38 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.38:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.39 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.39:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.42 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.42:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.48 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.48:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.55 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.55:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.57 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.57:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.61 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.61:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.62 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.62:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.67 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.67:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.70 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.70:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.71 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.71:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.76 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.76:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.82 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.82:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.84 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.84:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.16.4.85 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.85:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.17.1 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.17.1:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.17.1.7 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.17.1.7:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.17.1.9 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.17.1.9:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software 9.17.1.10 cpe:2.3:o:cisco:adaptive_security_appliance_software:9.17.1.10:*:*:*:*:*:*:*

References for CVE-2026-20022

cvelogic Threat Intelligence