Cisco Secure Email Gateway: Email Filter Bypass via Crafted Email
CVE-2025-20153 Published on February 19, 2025
Cisco ESA mail Bypass
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.
Vulnerability Analysis
CVE-2025-20153 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2025-20153 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2025-20153
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Affected Versions
Cisco Secure Email:- Version 14.0.0-698 is affected.
- Version 13.5.1-277 is affected.
- Version 13.0.0-392 is affected.
- Version 14.2.0-620 is affected.
- Version 13.0.5-007 is affected.
- Version 13.5.4-038 is affected.
- Version 14.2.1-020 is affected.
- Version 14.3.0-032 is affected.
- Version 15.0.0-104 is affected.
- Version 15.0.1-030 is affected.
- Version 15.5.0-048 is affected.
- Version 15.5.1-055 is affected.
- Version 15.5.2-018 is affected.
- Version 16.0.0-050 is affected.
- Version 15.0.3-002 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.