VulnerabilityModified

CVE-2023-20135

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.

HIGH 7.0EPSS 0.09%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.09% probability · 0th percentile
CISA KEV: Not listed
Weakness: CWE-347, CWE-367
Affected: cisco/ios xr
Source: psirt@cisco.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.