CVE-2026-20353
Received Received - Intake

Improper Resource Control in Cisco Secure Email Gateway

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Cisco Systems, Inc.

Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20353 are related to issues with improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.

CVSS Scores

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-20353
EUVD
EUVD-2026-77621

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
cisco secure_email_gateway *
cisco secure_email_and_web_manager *
cisco secure_email_gateway 15.5.5-014
cisco secure_email_and_web_manager 15.5.5-006

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-664 The product does not maintain or incorrectly maintains control over a resource throughout its lifetime of creation, use, and release.

Attack-Flow Graph

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Executive Summary

This vulnerability involves improper control of a resource throughout its lifetime, classified under CWE-664. It was discovered during Cisco's internal security review of their Secure Email Gateway and Secure Email and Web Manager products.

Impact Analysis

The vulnerability could allow unauthorized access, data manipulation, or system disruption due to improper resource management. It has a high severity score (9.8) indicating significant potential impact on confidentiality, integrity, and availability.

Compliance Impact

The vulnerability involves improper control of a resource through its lifetime (CWE-664), which could lead to unauthorized access or data breaches. This may impact compliance with GDPR by risking unauthorized data processing or exposure, and with HIPAA by potentially compromising protected health information integrity or confidentiality.

Mitigation Strategies

Apply the latest security updates or patches provided by Cisco for the affected products (Secure Email Gateway and Secure Email and Web Manager) to address the improper resource control issues.

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