What is CVE-2026-20074?

CVE-2026-20074 is a high-severity vulnerability in Cisco Ios Xr Software, classified under CWE-1287. CVSS score: 7.4/10. Published 2026-03-11.

How severe is CVE-2026-20074?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Cisco Ios Xr Software

CVE-2026-20074

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) multi-instance routing feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the IS-IS process to restart unexpectedly. This…

EPSS: 0.001 (15.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xr Software — versions 7.8.1, 7.9.1, 7.10.1

Weakness classification (CWE)

CWE-1287

References

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Frequently asked questions

What is CVE-2026-20074?: CVE-2026-20074 is a high-severity vulnerability in Cisco Ios Xr Software, classified under CWE-1287. CVSS score: 7.4/10. Published 2026-03-11.
How severe is CVE-2026-20074?: High severity. CVSS v3 base score is 7.4 out of 10.