Detections
Analytics
Cisco IOS XR Software Image Verification Bypass (cisco-sa-xrsig-UY4zRUCG)
medium Nessus Plugin ID 264641
Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco IOS XR is affected by a vulnerability.- A vulnerability in the installation process of Cisco IOS XR Software could allow an authenticated, local attacker to bypass Cisco IOS XR Software image signature verification and load unsigned software on an affected device. To exploit this vulnerability, the attacker must have root-system privileges on the affected device.
This vulnerability is due to incomplete validation of files during the installation of an .iso file. An attacker could exploit this vulnerability by modifying contents of the .iso image and then installing and activating it on the device. A successful exploit could allow the attacker to load an unsigned file as part of the image activation process.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwm03455See Also
http://www.nessus.org/u?655f58a9
Plugin Details
Severity: Medium
ID: 264641
File Name: cisco-sa-xrsig-UY4zRUCG-iosxr.nasl
Version: 1.1
Type: combined
Family: CISCO
Published: 9/12/2025
Updated: 9/12/2025
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.7
CVSS v2
Risk Factor: Medium
Base Score: 5.9
Temporal Score: 4.4
Vector: CVSS2#AV:L/AC:L/Au:M/C:C/I:C/A:N
CVSS Score Source: CVE-2025-20248
CVSS v3
Risk Factor: Medium
Base Score: 6
Temporal Score: 5.2
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:cisco:ios_xr
Required KB Items: Host/Cisco/IOS-XR/Version, Host/Cisco/IOS-XR/Model
Exploit Ease: No known exploits are available
Patch Publication Date: 9/10/2025
Vulnerability Publication Date: 9/10/2025
Reference Information
CVE: CVE-2025-20248