CVE-2025-20143Cisco IOS XR Software Secure Boot Bypass Vulnerability
- 6.7MediumCVSS base score
- 0.11%Exploitation in 30 daysEPSS · top 99% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker with high privileges to bypass the Secure Boot functionality 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 insufficient verification of modules in the software load process. An attacker could exploit this vulnerability by manipulating the loaded binaries to bypass some of the integrity checks that are performed during the booting 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: This vulnerability affects Cisco IOS XR Software, not the Secure Boot feature. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Timeline
ID reserved
By cisco
- 5 months later
· 5 months later
Published
- 12 months later
· 12 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Medium6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.11% · top 99% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.7.
Affected products
- affected 6.5.3
- affected 6.5.2
- affected 6.5.92
- affected 6.5.1
- affected 6.5.15
- affected 6.6.2
- affected 7.0.1
- affected 6.6.25
- affected 6.6.1
- affected 6.6.11
- affected 6.5.93
- affected 6.6.12
- affected 7.0.0
- affected 7.1.1
- affected 7.0.90
- affected 6.6.3
- 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 7.1.25
- affected 6.6.4
- affected 7.3.1
- affected 7.1.3
- affected 6.7.3
- affected 7.4.1
- affected 7.2.2
- 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 7.6.15
- affected 7.3.3
- and 19 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
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-6452 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-20143)Record last updated .