CVE-2025-20153

Name: CVE-2025-20153
Creator: NVD / NIST
Published: 2025-02-19T16:15:40.86+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2025-20153 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A vulnerability in the email filtering mechanism of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to bypass the configured rules and allow emails that should have been denied to flow through an affected device.   This vulnerability is due to improper handling of email that passes through an affected device. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

A vulnerability in the email filtering mechanism of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to bypass the configured rules and allow emails that should have been denied to flow through an affected device.   This vulnerability is due to improper handling of email that passes through an affected device. An attacker could exploit this vulnerability by sending a crafted email through the affected device. A successful exploit could allow the attacker to bypass email filters on the affected device.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.33%

25.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Cisco	Secure Email Gateway	13.0.0-392
Cisco	Secure Email Gateway	13.0.5-007
Cisco	Secure Email Gateway	13.5.1-277
Cisco	Secure Email Gateway	13.5.4-038
Cisco	Secure Email Gateway	14.0.0-698
Cisco	Secure Email Gateway	14.2.0-620
Cisco	Secure Email Gateway	14.2.1-020
Cisco	Secure Email Gateway	14.3.0-032
Cisco	Secure Email Gateway	15.0.0-104
Cisco	Secure Email Gateway	15.0.1-030
Cisco	Secure Email Gateway	15.0.3-002
Cisco	Secure Email Gateway	15.5.0-048
Cisco	Secure Email Gateway	15.5.1-055
Cisco	Secure Email Gateway	15.5.2-018
Cisco	Secure Email Gateway	16.0.0-050

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-mailpol-bypass-5nVcJZMwVendor Advisory

Timeline

Published: Feb 19, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-20153?

How severe is CVE-2025-20153?

CVE-2025-20153 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2025-20153?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-20153?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST