SARA / Free Tools / CVE / CVE-2023-20135

CVE-2023-20135 — A vulnerability in Cisco IOS XR Software image verification checks could allow a

A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query re

CVSS
5.7 MEDIUM
EPSS
0.02% (top 96.80%)
CWE
CWE-347
Published
2023-09-13T16:38:36.593Z
Last modified
2025-12-16T18:23:19.364Z
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N

01What is this vulnerability?

A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this…

02Affected products

VendorProductVersions
CiscoCisco IOS XR Software7.5.3, 7.5.2, 7.5.4, 7.7.1, 7.7.2, 7.7.21, 7.8.1, 7.8.2, 7.9.1, 7.9.2

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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