CVE-2025-20258: A vulnerability in the self-service portal of Cisco Duo could allow an unauthenticated, remote attacker to inj

Routine

MEDIUM 5.4MITIGATE

CVE-2025-20258 is a medium-severity flaw (CVSS 5.4) affecting duo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 malic

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-77
Published	2025-05-21
Last modified	2026-06-17

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-21 17:15 UTCPublished CVE record published
2026-06-17 08:41 UTCUpdated Record last modified

cisco duo MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy duo || rpm -q duo || duo --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-20258?

duo: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-20258 being exploited?

CVE-2025-20258 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-20258 affect?

CVE-2025-20258 affects duo. Severity is medium (CVSS 5.4). 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

How urgent is CVE-2025-20258?

Priority 25/100. No elevated risk signals yet.

Software pages

Cisco vulnerabilities

References

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