What does unpatched mean?
Unpatched is an adjective meaning that a repair, correction, or update has not been applied. Its dominant modern use is in computing: an unpatched program, device, or server lacks a fix for a known defect or security vulnerability. Such a system may continue operating normally, making the term especially important because technical problems can remain hidden until they are exploited or cause a failure. The word can also be used literally for a torn garment, damaged object, or other thing without a patch. In professional and administrative contexts, unpatched often implies a failure to keep software current or to respond to a security advisory. It is most useful when precision matters: an item may function well yet remain unpatched and vulnerable despite appearing normal.
adjectiveNot patched; lacking an applied repair, correction, or update. In computing, it most often refers to software or a system without an installed security fix or corrective update.
- In computing, lacking an installed software update, security fix, or corrective change.
- Literally, lacking a patch, covering, or repair applied to it.
"The security team warned that an unpatched server remained vulnerable to the disclosed flaw."
"The hospital replaced unpatched systems before the security deadline."
"The old coat remained unpatched at the elbow, where the frayed thread was beyond repair."
An unpatched device is not merely outdated—it may be an open door with a login screen.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unpatched come from?
Unpatched is an English formation combining the negating prefix un- with patch. Patch is attested in English from the medieval period, while the un- formation became especially common in technical usage during the modern era. Its computing sense derives from patch meaning a corrective change to software. Closely related forms include patchable, patcher, and patchwork.
How unpatched is actually used
The word is chiefly used in computing and systems administration, where it carries a security warning or concern. It can also describe a literal hole, garment, or object that has not been repaired, but that use is comparatively uncommon.