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CVE-2023-20135

A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code…

Medium5.7EPSS 0.09%
Published
Updated
Reserved
Assigned by
cisco

Description

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 vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.

Scores

CVSS scores of CVE-2023-20135, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium5.7CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Modified3.1High7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.09% · top 99% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.7.

Weakness

Affected products

  • Cisco · Cisco IOS XR Software

    • affected 7.5.3
    • affected 7.5.2
    • affected 7.5.4
    • affected 7.7.1
    • affected 7.7.2
    • affected 7.7.21
    • affected 7.8.1
    • affected 7.8.2
    • affected 7.9.1
    • affected 7.9.2

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2023-20135 badge
[![CVE-2023-20135](https://trackcve.app/badge/CVE-2023-20135.svg)](https://trackcve.app/cve/CVE-2023-20135)

Record last updated .