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CVE-2026-20353— Cisco Secure Email Gateway Security Hardening Release

Quick assessment

Affected
Cisco Cisco Secure Email
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

作为思科对主动安全与产品质量持续承诺的一部分，思科安全邮件网关（Cisco Secure Email Gateway）和思科安全邮件与Web管理器（Cisco Secure Email and Web Manager）工程团队进行了一次全面的内部安全审查。此次审查促成了软件加固版本的发布，以解决多个内部发现的漏洞。 由 CVE-2026-20353 跟踪的漏洞与资源生命周期中不适当的资源控制问题相关，这些问题归类于通用弱点枚举（CWE）中的 CWE-664 类别。

CVSS 9.8 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-20353

Vulnerability Information
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Vulnerability Title
Cisco Secure Email Gateway Security Hardening Release
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在生命周期中对资源的控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Secure Email 14.0.0-698 -

II. Public POCs for CVE-2026-20353

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III. Intelligence Information for CVE-2026-20353

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Vendor Advisories for CVE-2026-20353 (1)

Same Patch Batch · Cisco · 2026-09-14 · 6 CVEs total

CVE-2026-76461 9.8 CRITICAL Cisco Secure Email Gateway SQL Injection Vulnerability
CVE-2026-76443 9.8 CRITICAL Cisco Secure Email Gateway Security Hardening Release
CVE-2026-76440 9.8 CRITICAL Cisco Secure Email Gateway Security Hardening Release
CVE-2026-76441 9.8 CRITICAL Cisco Secure Email Gateway Security Hardening Release
CVE-2026-76442 7.5 HIGH Cisco Secure Email Gateway Security Hardening Release

IV. Related Vulnerabilities

Same product: Cisco Secure Email
Same vendor: Cisco
Same weakness: CWE-664

V. Comments for CVE-2026-20353

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