CVE-2026-20020
What it is
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. If OSPF authentication is enabled, the attacker must know the secret key to exploit this vulnerability. This vulnerability is due to insufficient input validation when processing OSPF update packets. An attacker could exploit this vulnerability by sending crafted OSPF update packets. A successful exploit could allow the attacker to create a buffer overflow, causing the affected device to reload, resulting in a DoS condition.
At a glance
- Exploitability
- Can be exploited from the same network segment with a low-privilege account. High risk of service disruption.
- Exploit odds
- 0.3% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.3% in the next 30 days (EPSS).
- Severity: 6.8 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.3% · EPSS, next 30 days
- Weakness
- CWE-20 · Improper input validation
- Record status
- Analyzed
Affected
- Cisco Adaptive Security Appliance Software 9.12.1
- Cisco Adaptive Security Appliance Software 9.12.1.2
- Cisco Adaptive Security Appliance Software 9.12.1.3
- Cisco Adaptive Security Appliance Software 9.12.2
- Cisco Adaptive Security Appliance Software 9.12.2.1
- Cisco Adaptive Security Appliance Software 9.12.2.4
- Cisco Adaptive Security Appliance Software 9.12.2.5
- Cisco Adaptive Security Appliance Software 9.12.2.9
Attack profile CVSS 3.1 · 6.8
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-20020.md and follow it. Check whether this project is affected by CVE-2026-20020. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
