Cisco IOS XR 6.4 · Version Status
Cisco IOS XR 6.4 End of Life Date
Cisco IOS XR 6.4 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
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Cisco IOS XR 6.4 is past end of life. This version no longer receives security patches. 1625 days past EOL — migrate to a supported version immediately.
EOL Date
Mar 29, 2022
1625 days past EOL
Latest Release
6.4
Standard release
Release Date
—
Cisco IOS XR 6.4 series
Extended Support
Sep 30, 2024
Extended support · ended
Lifecycle detail
It has been without security patches for 4 years and 6 months.
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 → ·
View score card →
Extended Support
Extended Cisco IOS XR 6.4 support is available
Commercial vendors offer security patches beyond EOL. Compare your options.
Compare Options →
All Cisco IOS XR Versions
| Version | Latest | EOL Date | Status |
|---|
| 3.3 |
3.3 |
Dec 31, 2011 |
EOL |
| 3.4 |
3.4 |
Dec 31, 2011 |
EOL |
| 3.5 |
3.5 |
May 11, 2012 |
EOL |
| 3.6 |
3.6 |
Jun 30, 2012 |
EOL |
| 3.8 |
3.8 |
Dec 28, 2013 |
EOL |
| 3.9 |
3.9 |
Apr 9, 2012 |
EOL |
| 4.0 |
4.0 |
Oct 1, 2014 |
EOL |
| 4.1 |
4.1 |
Mar 19, 2016 |
EOL |
What does Cisco IOS XR 6.4 end of life mean?
When Cisco IOS XR 6.4 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 IOS XR 6.4 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Cisco IOS XR 26.1 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Cisco IOS XR 6.4 reach end of life?
Cisco IOS XR 6.4 reached end of life on March 29, 2022. This version is no longer receiving security patches.
Is Cisco IOS XR 6.4 still supported?
No. Cisco IOS XR 6.4 reached end of life on March 29, 2022 and is no longer receiving security patches.
What should I upgrade to from Cisco IOS XR 6.4?
The recommended upgrade from Cisco IOS XR 6.4 is
Cisco IOS XR 26.1 — the latest actively supported version. Check the
Cisco IOS XR full timeline for all supported versions.
What are the security risks of running Cisco IOS XR 6.4 past EOL?
When Cisco IOS XR 6.4 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 IOS XR should migrate immediately or implement compensating controls.