postmarketOS 21.03 End of Life Date
postmarketOS 21.03 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
postmarketOS 21.03 was released on March 31, 2021 and support ended on August 4, 2021 — a supported lifespan of 4 months, shorter than the 7 months median for postmarketOS releases. It has been without security patches for 5 years and 1 month. 10 newer postmarketOS releases have shipped since.
What does postmarketOS 21.03 end of life mean?
When postmarketOS 21.03 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 postmarketOS 21.03 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to a supported version or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.