Firefox 115 End of Life Date
Firefox 115 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
Firefox 115 was released on July 4, 2023 and support is scheduled to end on March 31, 2027 — a planned supported lifespan of 3 years and 9 months, longer than the 1 year and 3 months median for Firefox LTS releases. It is a long-term support (LTS) release, so it carries a longer patch window than the interim releases around it. Its most recent patch is 115.38.0, published July 21, 2026.
What does Firefox 115 end of life mean?
When Firefox 115 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 Firefox 115 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Firefox 153 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.