Cisco Secure Firewall Threat Defense (FTD) 6.6 · Version Status
Cisco Secure Firewall Threat Defense (FTD) 6.6 End of Life Date
Cisco Secure Firewall Threat Defense (FTD) 6.6 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Cisco Secure Firewall Threat Defense (FTD) 6.6 is past end of life. This version no longer receives security patches. 1280 days past EOL — migrate to a supported version immediately.
EOL Date
Mar 2, 2023
1280 days past EOL
Latest Release
6.6.7.2
Standard release
Release Date
May 8, 2020
Cisco Secure Firewall Threat Defense (FTD) 6.6 series
Extended Support
Mar 31, 2025
Extended support · ended
Lifecycle detail
Cisco Secure Firewall Threat Defense (FTD) 6.6 was released on May 8, 2020 and support ended on March 2, 2023 — a supported lifespan of 2 years and 10 months, in line with the 3 years and 1 month median for Cisco Secure Firewall Threat Defense (FTD) releases. It has been without security patches for 3 years and 6 months. 4 newer Cisco Secure Firewall Threat Defense (FTD) releases have shipped since.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
20/20 Named in CISA KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
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Extended Support
Extended Cisco Secure Firewall Threat Defense (FTD) 6.6 support is available
Commercial vendors offer security patches beyond EOL. Compare your options.
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All Cisco Secure Firewall Threat Defense (FTD) Versions
| Version | Latest | EOL Date | Status |
|---|
| 6.3 |
6.3.0.5 |
Apr 30, 2021 |
EOL |
| 6.4 |
6.4.0.18 |
Feb 27, 2024 |
EOL |
| → 6.6 |
6.6.7.2 |
Mar 2, 2023 |
EOL |
| 6.7 |
6.7.0.3 |
Jul 9, 2022 |
EOL |
| 7.0 |
7.0.9 |
Nov 18, 2026 |
Warning |
| 7.1 |
7.1.0.3 |
Dec 21, 2024 |
EOL |
| 7.2 |
7.2.11 |
Nov 18, 2026 |
Warning |
| 7.3 |
7.3.1.2 |
May 18, 2026 |
EOL |
What does Cisco Secure Firewall Threat Defense (FTD) 6.6 end of life mean?
When Cisco Secure Firewall Threat Defense (FTD) 6.6 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Cisco Secure Firewall Threat Defense (FTD) 6.6 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Cisco Secure Firewall Threat Defense (FTD) 10.0 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Cisco Secure Firewall Threat Defense (FTD) 6.6 reach end of life?
Cisco Secure Firewall Threat Defense (FTD) 6.6 reached end of life on March 2, 2023. This version is no longer receiving security patches.
Is Cisco Secure Firewall Threat Defense (FTD) 6.6 still supported?
No. Cisco Secure Firewall Threat Defense (FTD) 6.6 reached end of life on March 2, 2023 and is no longer receiving security patches.
What should I upgrade to from Cisco Secure Firewall Threat Defense (FTD) 6.6?
What are the security risks of running Cisco Secure Firewall Threat Defense (FTD) 6.6 past EOL?
When Cisco Secure Firewall Threat Defense (FTD) 6.6 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Cisco Secure Firewall Threat Defense (FTD) should migrate immediately or implement compensating controls.