How severe is CVE-2025-20258?

CVE-2025-20258 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-20258 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20258?

CVE-2025-20258 affects Cisco Duo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-20258?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-20258 have an EU (EUVD) identifier?

Yes. CVE-2025-20258 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16045.

When was CVE-2025-20258 published?

CVE-2025-20258 was published on 2025-05-21 and last updated on 2026-06-17.

CVE-2025-20258

CVE-2025-20258 is a medium-severity vulnerability in Cisco Duo with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16045
Weakness: CWE-77
Affected product: Cisco Duo
Published: 2025-05-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-20258?: 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.
How severe is CVE-2025-20258?: CVE-2025-20258 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-20258 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20258?: CVE-2025-20258 affects Cisco Duo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-20258?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-20258 have an EU (EUVD) identifier?: Yes. CVE-2025-20258 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16045.
When was CVE-2025-20258 published?: CVE-2025-20258 was published on 2025-05-21 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-duo-ssp-cmd-inj-RCmYrNA

Affected products (1)

cpe:2.3:a:cisco:duo:-:*:*:*:*:-:*:*

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