Is CVE-2026-20022 actively exploited?

No active exploitation of CVE-2026-20022 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-20022 be exploited remotely?

Partially. CVE-2026-20022 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-20022?

CVE-2026-20022 has a CVSS score of 6.1 (MEDIUM).

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MEDIUM

CVE-2026-20022

CWE-823Published: March 4, 2026· Updated: Mar 5, 2026

6.1

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-20022 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.1.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.