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CVE-2026-20274

CRITICAL · CVSS 9.8EPSS 0.7%EU EUVD

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-2026-20274 are related to improper resource control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-664.

Key facts

CVSS score
9.8 (v3.1)
Severity
CRITICAL
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-664
EPSS score
0.7% (53th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2026-70204)
Published
September 2, 2026
NVD last modified
September 17, 2026
Status
Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-70204 in the EU Vulnerability Database. Last updated in EUVD on September 18, 2026.

View on the EU Vulnerability Database

Affected products

  • cisco / ios xr
  • cisco / ios xr
  • cisco / ios xr
  • cisco / ios xr
  • cisco / ios xr
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  • cisco / ios xr
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  • cisco / ios xr
  • cisco / ios xr
  • cisco / ios xr

and 61 more…

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

References

Last updated September 19, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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