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CVE-2025-20177

Cisco IOS XR Software Image Verification Bypass Vulnerability

Medium6.7EPSS 0.17%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker to bypass Cisco IOS XR image signature verification and load unverified 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 in the boot verification process. An attacker could exploit this vulnerability by manipulating the system configuration options to bypass some of the integrity checks that are performed during the boot process. A successful exploit could allow the attacker to control the boot configuration, which could enable them to bypass the requirement to run Cisco-signed images or alter the security properties of the running system. Note: Because exploitation of this vulnerability could result in the attacker bypassing Cisco image verification, Cisco has raised the Security Impact Rating (SIR) of this advisory from Medium to High.

Scores

CVSS scores of CVE-2025-20177, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1Medium6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.17% · top 94% of all CVEs (5 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 6.7.

Weakness

Affected products

  • Cisco · Cisco IOS XR Software

    • affected 7.0.1
    • affected 7.0.0
    • affected 7.1.1
    • affected 7.0.90
    • affected 6.7.1
    • affected 7.0.2
    • affected 7.1.15
    • affected 7.2.0
    • affected 7.2.1
    • affected 7.1.2
    • affected 6.7.2
    • affected 7.0.11
    • affected 7.0.12
    • affected 7.0.14
    • affected 7.1.25
    • affected 7.2.12
    • affected 7.3.1
    • affected 7.1.3
    • affected 6.7.3
    • affected 7.4.1
    • affected 7.2.2
    • affected 6.7.4
    • affected 7.3.15
    • affected 7.3.16
    • affected 6.8.1
    • affected 7.4.15
    • affected 7.3.2
    • affected 7.5.1
    • affected 7.4.16
    • affected 7.3.27
    • affected 7.6.1
    • affected 7.5.2
    • affected 7.8.1
    • affected 7.6.15
    • affected 7.5.12
    • affected 7.3.3
    • affected 7.7.1
    • affected 6.8.2
    • affected 7.3.4
    • affected 7.4.2
    • and 27 more

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 (2)

Sources

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

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Record last updated .