CISA listed Cisco Secure Email Gateway CVE-2026-76461 on September 14, 2026 with a September 17 deadline.
What Cisco fixed, and the row that is missing
| AsyncOS train | First fixed release | End of software maintenance | End of security support |
|---|---|---|---|
| 16.5 | 16.5.0-780 (Cisco's recommended release) | August 30, 2027 | August 30, 2029 |
| 16.0 | 16.0.4-302 | October 30, 2025 | October 30, 2027 |
| 15.5 | 15.5.5-014 (the row reads "15.5 and earlier") | October 30, 2026 | April 30, 2027 |
| 15.0 | None; upgrade to 15.5.5-014 | October 30, 2025 | April 30, 2027 |
| 14.3, 14.2, 14.0, 13.5, 13.0 | None; upgrade to 15.5.5-014 | Not in Cisco's table | Not in Cisco's table |
What's covered
- What Cisco fixed, and the row that is missing
- What to do, by train
Full guide with every version, risk scores, and live updates: https://endoflife.ai/article-cisco-secure-email-gateway-cve-2026-76461
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