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.
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 4 months ago. Security fixes now come only through extended support; without it this version is unpatched. 1 newer Bootstrap release has shipped since.
Extended support for Bootstrap exists: vetted vendors ship security patches past the official date. Right now that coverage spans Bootstrap 2 - 4. Whether it covers Bootstrap 3 is part of what we check. Leave an email and we reply within one business day with matched options and pricing guidance, or an honest "no vendor covers this version." Free, no obligation; vendors do not pay for placement.
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.