Is CVE-2026-20277 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-20277?

CVE-2026-20277 has a CVSS v3 severity of HIGH (8.2).

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CVE-2026-20277

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20277 are related to protection mechanism failure issues that are grouped under the Common Weakness Enumeration (CWE) CWE-693.