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5.8
MEDIUM CVSS 3.1
CVE-2025-20153
"Cisco Secure Email Gateway Email Filter Bypass Vulnerability"
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.

INFO

Published Date :

Feb. 19, 2025, 4:15 p.m.

Last Modified :

July 31, 2025, 12:40 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2025-20153 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco secure_email_gateway
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 MEDIUM [email protected]
Solution
Address the email filtering bypass vulnerability by applying vendor updates and ensuring proper email handling configurations.
  • Apply the latest security patches from the vendor.
  • Review and reconfigure email filtering rules.
  • Monitor email traffic for bypass attempts.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-20153.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-mailpol-bypass-5nVcJZMw Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-20153 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-20153 weaknesses.

CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-20153 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-20153 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jul. 31, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
    Added CWE NVD-CWE-noinfo
    Added CPE Configuration OR *cpe:2.3:a:cisco:secure_email_gateway:13.0.0-392:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:13.0.5-007:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:13.5.1-277:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:13.5.4-038:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:14.0.0-698:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:14.2.0-620:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:14.2.1-020:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:14.3.0-032:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:15.0.0-104:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:15.0.1-030:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:15.0.3-002:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:15.5.0-048:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:15.5.1-055:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:15.5.2-018:*:*:*:*:*:*:* *cpe:2.3:a:cisco:secure_email_gateway:16.0.0-050:*:*:*:*:*:*:*
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-mailpol-bypass-5nVcJZMw Types: Vendor Advisory
  • New CVE Received by [email protected]

    Feb. 19, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
    Added CWE CWE-284
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-mailpol-bypass-5nVcJZMw
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact