What’s Vulnerable › Products
Cisco Email Security Appliance (ESA) vulnerabilities
57 known vulnerabilities, 0 confirmed exploited in the wild (CISA KEV), 8 published in the last 12 months.
Check whether your Cisco Email Security Appliance (ESA) version is affected
Latest Cisco Email Security Appliance (ESA) vulnerabilities
- CVE-2026-76443 — Cisco Secure Email Gateway Security Hardening Release (CVSS 9.8)
- CVE-2026-76442 — Cisco Secure Email Gateway Security Hardening Release (CVSS 7.5)
- CVE-2026-76440 — Cisco Secure Email Gateway Security Hardening Release (CVSS 9.8)
- CVE-2026-20353 — Cisco Secure Email Gateway Security Hardening Release (CVSS 9.8)
- CVE-2026-20355 — Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty (CVSS 5.9)
- CVE-2026-20354 — Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty (CVSS 5.9)
- CVE-2025-20207 — Cisco Secure Email Gateway, Cisco Secure Email and Web Appliance and Cisco Secure Web Appliance SNMP Polling Information Disclosure Vulnerability (CVSS 4.3)
- CVE-2020-3548 — Cisco Email Security Appliance Denial Of Service Vulnerability (CVSS 7.5)
- CVE-2023-20075 — (CVSS 6.7)
- CVE-2023-20009 — (CVSS 7.2)
- CVE-2022-20960 — (CVSS 7.5)
- CVE-2022-20798 — Cisco Email Security Appliance and Cisco Secure Email and Web Manager External Authentication Bypass Vulnerability (CVSS 9.8)
- CVE-2022-20664 — Cisco Email Security Appliance and Cisco Secure Email and Web Manager Information Disclosure Vulnerability (CVSS 7.7)
- CVE-2021-1566 — Cisco Email Security Appliance and Cisco Web Security Appliance Certificate Validation Vulnerability (CVSS 7.4)
- CVE-2021-1516 — Cisco Content Security Management Appliance, Email Security Appliance, and Web Security Appliance Information Disclosure Vulnerability (CVSS 6.5)
- CVE-2021-1129 — Cisco Email Security Appliance, Cisco Content Security Management Appliance, and Cisco Web Security Appliance Information Disclosure Vulnerability (CVSS 5.3)
- CVE-2020-3137 — Cisco Email Security Appliance Cross-Site Scripting Vulnerability (CVSS 6.1)
- CVE-2020-3133 — Cisco Email Security Appliance Content Filter Bypass Vulnerability (CVSS 7.5)
- CVE-2019-1983 — Cisco Email Security Appliance and Cisco Content Security Management Appliance Denial of Service Vulnerability (CVSS 5.3)
- CVE-2019-1947 — Cisco Email Security Appliance Denial of Service Vulnerability (CVSS 8.6)
- CVE-2020-3447 — Cisco Email Security Appliance and Cisco Content Security Management Appliance Information Disclosure Vulnerability (CVSS 6.5)
- CVE-2020-3370 — Cisco Content Security Management Appliance Filter Bypass Vulnerability (CVSS 5.8)
- CVE-2020-3181 — Cisco Email Security Appliance Uncontrolled Resource Exhaustion Vulnerability (CVSS 6.5)
- CVE-2020-3164 — Cisco ESA, Cisco WSA, and Cisco SMA GUI Denial of Service Vulnerability (CVSS 5.3)
- CVE-2020-3132 — Cisco Email Security Appliance Shortened URL Denial of Service Vulnerability (CVSS 5.9)