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A vulnerability in Cisco IOS XE Software could allow an authenticated, local attacker with level-15 privileges or an unauthenticated attacker with physical access to an affected device to execute persistent code at boot time and break the chain of trust.This vulnerability is due improper validation of software packages. An attacker could exploit these vulnerabilities by placing a crafted file into a specific location on an affected device. A successful exploit could allow the attacker to execute persistent code on the underlying operating system. Because this vulnerability allows an attacker to bypass a major security feature of a device, Cisco has raised the Security Impact Rating (SIR) of this advisory from Medium to High. The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
For information on fixed versions of software consult the Cisco IOS Software checker: https:/sec.cloudapps.cisco.com/security/center/softwarechecker.x See Vulnerable Products Section of the advisory for full details: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-secboot-UqFD8AvC#vp
There are no workarounds that address this vulnerability.
Please refer to the Security Advisory.
The Cisco PSIRT has assigned this bug the following CVSS version 3 score. The Base CVSS score as of the time of evaluation is 6.7: https://sec.cloudapps.cisco.com/security/center/cvssCalculator.x?version=3.0&vector=CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVE ID CVE-2025-20313 has been assigned to document this issue. Additional information on Cisco's security vulnerability policy can be found at the following URL: https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html
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