{"id":"CVE-2026-20353","title":"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","summary":"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 r…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-664"],"vendor":"Cisco","product":"Cisco Secure Email","affected":["secure_email 14.0.0-698","secure_email 13.5.1-277","secure_email 13.0.0-392","secure_email 14.2.0-620","secure_email 13.0.5-007","secure_email 13.5.4-038","secure_email 14.2.1-020","secure_email 14.3.0-032","secure_email 15.0.0-104","secure_email 15.0.1-030","secure_email 15.5.0-048","secure_email 15.5.1-055","secure_email 15.5.2-018","secure_email 16.0.0-050","secure_email 15.0.3-002","secure_email 16.0.0-054","secure_email 15.5.3-022","secure_email 16.0.1-017","secure_email 15.5.4-012","secure_email 16.0.4-016","secure_email 15.0.5-016","secure_email 16.0.2-112","secure_email 16.0.3-044"],"published":"2026-09-14","updated":"2026-09-15","sourceUpdated":"2026-09-15T18:17:19.887","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20353","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm","label":"psirt@cisco.com"},{"url":"https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://software.cisco.com"}],"tags":["nvd","cve.org","csaf","vendor-advisory","cisco"],"epss":0.00396,"epssPercentile":0.33615,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-14T16:34:25.342367Z"},"ingestedAt":"2026-09-14T16:34:40.809Z","slug":"CVE-2026-20353","body":"## Overview\n\nAs 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.\r\n\r\nThe 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **cisco-sa-hardening-esa-dfCrfXkm** · Cisco · affected: Cisco Secure Email (174 versions), Cisco Secure Email and Web Manager (175 versions) · updated 2026-09-14 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}