Secure Email Gateway vulnerabilities: known CVEs & security history
Cisco · Actively exploited · 10 tracked CVEs · 1 actively exploited · updated September 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Secure Email Gateway release lines — 10 in total, with 1 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Secure Email Gateway's current status and the safe version to run.
Known Secure Email Gateway CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2026-76461⚡ exploited | critical | 9.8 | — | 2026 |
| CVE-2026-76443 | critical | 9.8 | — | 2026 |
| CVE-2026-76440 | critical | 9.8 | — | 2026 |
| CVE-2026-20353 | critical | 9.8 | — | 2026 |
| CVE-2024-20401 | critical | 9.8 | 2% | 2024 |
| CVE-2026-76442 | high | 7.5 | — | 2026 |
| CVE-2023-20119 | medium | 6.1 | 1% | 2023 |
| CVE-2025-20153 | medium | 5.8 | 0% | 2025 |
| CVE-2023-20120 | medium | 5.4 | 0% | 2023 |
| CVE-2023-20028 | medium | 5.4 | 0% | 2023 |
Is my Secure Email Gateway version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Secure Email Gateway version → · Monitor Secure Email Gateway for new CVEs →
Secure Email Gateway vulnerabilities — frequently asked
How many known vulnerabilities does Secure Email Gateway have?
IsItPatched tracks 10 CVEs for Secure Email Gateway, 1 of which is actively exploited (CISA KEV). 5 are critical-severity and 1 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Secure Email Gateway have any actively-exploited vulnerabilities?
Yes — 1 Secure Email Gateway CVE is in CISA's Known Exploited Vulnerabilities catalog, meaning it is confirmed exploited in the wild. Patch it as a priority.
What is the most severe Secure Email Gateway vulnerability?
Among tracked issues, CVE-2026-76461 (CRITICAL, CVSS 9.8), which is actively exploited, ranks highest — a SQL injection weakness.
Is Secure Email Gateway safe to use?
It depends on the version. The latest supported Secure Email Gateway release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Secure Email Gateway security status · Secure Email Gateway end-of-life · actively-exploited CVEs. Always verify against Cisco's advisories — see our disclaimer.