Bootstrap 3 · Version Status
Bootstrap 3 End of Life Date
Bootstrap 3 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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Bootstrap 3 is past end of life. This version no longer receives security patches. 2618 days past EOL — migrate to a supported version immediately.
EOL Date
Jul 24, 2019
2618 days past EOL
Latest Release
3.4.1
LTS release
Release Date
Aug 19, 2013
Bootstrap 3 series
Lifecycle detail
Bootstrap 3 was released on August 19, 2013 and support ended on July 24, 2019 — a supported lifespan of 5 years and 11 months, longer than the 5 years median for Bootstrap releases. It was a long-term support (LTS) release, so it received a longer patch window than the interim releases around it. Its most recent release is 3.4.1, published February 13, 2019. Standard support ended 7 years and 2 months ago. Security fixes now come only through extended support; without it this version is unpatched. 1 newer Bootstrap release has shipped since.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
0/20 Not in 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 Bootstrap 3 support is available
Commercial vendors offer security patches beyond EOL. Right now that coverage spans Bootstrap 2 - 4. Compare your options.
Compare Options →
| Version | Latest | EOL Date | Status |
|---|
| 2 |
2.3.2 |
Aug 19, 2013 |
EOL |
| → 3 LTS |
3.4.1 |
Jul 24, 2019 |
EOL |
| 4 LTS |
4.6.2 |
Jan 1, 2023 |
EOL |
| 5 LTS |
5.3.8 |
EOL |
Active |
What does Bootstrap 3 end of life mean?
When Bootstrap 3 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: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Bootstrap 3 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to Bootstrap 5 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Bootstrap 3 reach end of life?
Bootstrap 3 reached end of life on July 24, 2019. This version is no longer receiving security patches.
Is Bootstrap 3 still supported?
No. Bootstrap 3 reached end of life on July 24, 2019 and is no longer receiving security patches.
What should I upgrade to from Bootstrap 3?
The recommended upgrade from Bootstrap 3 is
Bootstrap 5 — the latest actively supported version. Check the
Bootstrap full timeline for all supported versions.
What are the security risks of running Bootstrap 3 past EOL?
When Bootstrap 3 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL Bootstrap should migrate immediately or implement compensating controls.