CVE-2025-20258: Cisco Duo · Command Injection
Affects Cisco DuoSource GCVE Database
Not known to be exploited · CVSS 5.4 Medium.
Data as of 3 Nov 2026, 23:28 UTC
Thin evidence
One scorer or none| CNA (cisco) | CVSS 3.1 | 5.4 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 21 May 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
Description
A vulnerability in the self-service portal of Cisco Duo could allow an unauthenticated, remote attacker to inject arbitrary commands into emails that are sent by the service. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by injecting arbitrary commands into a portion of an email that is sent by the service. A successful exploit could allow the attacker to send emails that contain malicious content to unsuspecting users.