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 authenticated, adjacent attacker to exhaust memory on an affected device, resulting in a denial of service (DoS) condition.

This vulnerability is due to improperly validating input by the OSPF protocol when parsing packets. An attacker could exploit this vulnerability by by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to exhaust memory on the affected device, resulting in a DoS condition.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0002.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software affected
Version Status Constraints
9.12.1 affected —
9.12.1.2 affected —
9.12.1.3 affected —
9.12.2 affected —
9.12.2.4 affected —
9.12.2.5 affected —
9.12.2.9 affected —
9.12.3 affected —
9.12.3.2 affected —
9.12.3.7 affected —
9.12.4 affected —
9.12.3.12 affected —
9.12.3.9 affected —
9.12.2.1 affected —
9.12.4.2 affected —
9.12.4.4 affected —
9.12.4.7 affected —
9.12.4.10 affected —
9.12.4.13 affected —
9.12.4.8 affected —
9.12.4.18 affected —
9.12.4.24 affected —
9.12.4.26 affected —
9.12.4.29 affected —
9.12.4.30 affected —
9.12.4.35 affected —
9.12.4.37 affected —
9.12.4.38 affected —
9.12.4.39 affected —
9.12.4.40 affected —
9.12.4.41 affected —
9.12.4.47 affected —
9.12.4.48 affected —
9.12.4.50 affected —
9.12.4.52 affected —
9.12.4.54 affected —
9.12.4.55 affected —
9.12.4.56 affected —
9.12.4.58 affected —
9.12.4.62 affected —
9.12.4.65 affected —
9.12.4.67 affected —
9.16.1 affected —
9.16.1.28 affected —
9.16.2 affected —
9.16.2.3 affected —
9.16.2.7 affected —
9.16.2.11 affected —
9.16.2.13 affected —
9.16.2.14 affected —
9.16.3 affected —
9.16.3.3 affected —
9.16.3.14 affected —
9.16.3.15 affected —
9.16.3.19 affected —
9.16.3.23 affected —
9.16.4 affected —
9.16.4.9 affected —
9.16.4.14 affected —
9.16.4.19 affected —
9.16.4.27 affected —
9.16.4.38 affected —
9.16.4.39 affected —
9.16.4.42 affected —
9.16.4.48 affected —
9.16.4.55 affected —
9.16.4.57 affected —
9.16.4.61 affected —
9.16.4.62 affected —
9.16.4.67 affected —
9.16.4.70 affected —
9.16.4.71 affected —
9.16.4.76 affected —
9.16.4.82 affected —
9.16.4.84 affected —
9.16.4.85 affected —
9.17.1 affected —
9.17.1.7 affected —
9.17.1.9 affected —
9.17.1.10 affected —
9.17.1.11 affected —
9.17.1.13 affected —
9.17.1.15 affected —
9.17.1.20 affected —
9.17.1.30 affected —
9.17.1.33 affected —
9.17.1.39 affected —
9.17.1.45 affected —
9.17.1.46 affected —
9.18.1 affected —
9.18.1.3 affected —
9.18.2 affected —
9.18.2.5 affected —
9.18.2.7 affected —
9.18.2.8 affected —
9.18.3 affected —
9.18.3.39 affected —
9.18.3.46 affected —
9.18.3.53 affected —
9.18.3.55 affected —
9.18.3.56 affected —
9.18.4 affected —
9.18.4.5 affected —
9.18.4.8 affected —
9.18.4.22 affected —
9.18.4.24 affected —
9.18.4.29 affected —
9.18.4.34 affected —
9.18.4.40 affected —
9.18.4.47 affected —
9.18.4.50 affected —
9.18.4.52 affected —
9.18.4.53 affected —
9.18.4.57 affected —
9.18.4.66 affected —
9.18.4.67 affected —
9.18.4.68 affected —
9.19.1 affected —
9.19.1.5 affected —
9.19.1.9 affected —
9.19.1.12 affected —
9.19.1.18 affected —
9.19.1.22 affected —
9.19.1.24 affected —
9.19.1.27 affected —
9.19.1.28 affected —
9.19.1.31 affected —
9.19.1.37 affected —
9.19.1.38 affected —
9.19.1.42 affected —
9.20.1 affected —
9.20.1.5 affected —
9.20.2 affected —
9.20.2.10 affected —
9.20.2.21 affected —
9.20.2.22 affected —
9.20.3 affected —
9.20.3.4 affected —
9.20.3.7 affected —
9.20.3.9 affected —
9.20.3.10 affected —
9.20.3.13 affected —
9.20.3.16 affected —
9.20.3.20 affected —
9.20.4 affected —
9.20.4.7 affected —
9.20.4.10 affected —
9.20.4.14 affected —
9.22.1.1 affected —
9.22.1.3 affected —
9.22.1.2 affected —
9.22.1.6 affected —
9.22.2 affected —
9.22.2.4 affected —
9.22.2.9 affected —
9.22.2.13 affected —
9.22.2.14 affected —
9.23.1 affected —
9.23.1.3 affected —
9.23.1.7 affected —
9.23.1.13 affected —
9.23.1.19 affected —
9.23.1.22 affected —
Cisco Cisco Secure Firewall Threat Defense (FTD) Software affected
Version Status Constraints
6.4.0 affected —
6.4.0.1 affected —
6.4.0.3 affected —
6.4.0.2 affected —
6.4.0.4 affected —
6.4.0.5 affected —
6.4.0.6 affected —
6.4.0.7 affected —
6.4.0.8 affected —
6.4.0.9 affected —
6.4.0.10 affected —
6.4.0.11 affected —
6.4.0.12 affected —
6.4.0.13 affected —
6.4.0.14 affected —
6.4.0.15 affected —
6.4.0.16 affected —
6.4.0.17 affected —
6.4.0.18 affected —
7.0.0 affected —
7.0.0.1 affected —
7.0.1 affected —
7.0.1.1 affected —
7.0.2 affected —
7.0.2.1 affected —
7.0.3 affected —
7.0.4 affected —
7.0.5 affected —
7.0.6 affected —
7.0.6.1 affected —
7.0.6.2 affected —
7.0.6.3 affected —
7.0.7 affected —
7.0.8 affected —
7.0.8.1 affected —
7.1.0 affected —
7.1.0.1 affected —
7.1.0.2 affected —
7.1.0.3 affected —
7.2.0 affected —
7.2.0.1 affected —
7.2.1 affected —
7.2.2 affected —
7.2.3 affected —
7.2.4 affected —
7.2.4.1 affected —
7.2.5 affected —
7.2.5.1 affected —
7.2.6 affected —
7.2.7 affected —
7.2.5.2 affected —
7.2.8 affected —
7.2.8.1 affected —
7.2.9 affected —
7.2.10 affected —
7.2.10.2 affected —
7.3.0 affected —
7.3.1 affected —
7.3.1.1 affected —
7.3.1.2 affected —
7.4.0 affected —
7.4.1 affected —
7.4.1.1 affected —
7.4.2 affected —
7.4.2.1 affected —
7.4.2.2 affected —
7.4.2.3 affected —
7.4.2.4 affected —
7.4.3 affected —
7.6.0 affected —
7.6.1 affected —
7.6.2 affected —
7.6.2.1 affected —
7.7.0 affected —
7.7.10 affected —
7.7.10.1 affected —

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospf-ZH8PhbSW cve-icon cve-icon
History

Thu, 05 Mar 2026 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco adaptive Security Appliance Software
Cisco secure Firewall Threat Defense
Vendors & Products Cisco
Cisco adaptive Security Appliance Software
Cisco secure Firewall Threat Defense

Wed, 04 Mar 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 04 Mar 2026 19:00:00 +0000

Type Values Removed Values Added
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 authenticated, adjacent attacker to exhaust memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to improperly validating input by the OSPF protocol when parsing packets. An attacker could exploit this vulnerability by by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to exhaust memory on the affected device, resulting in a DoS condition.
Weaknesses CWE-401
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-03-04T21:30:11.471Z

Reserved: 2025-10-08T11:59:15.352Z

Link: CVE-2026-20021

cve-icon Vulnrichment

Updated: 2026-03-04T21:30:06.900Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-04T19:16:12.150

Modified: 2026-03-05T19:39:11.967

Link: CVE-2026-20021

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-05T09:06:02Z

Weaknesses