CVE-2000-0844: Some functions that implement the locale subsystem on Unix do not properly cleanse user-injected format st...

Security readout for executives and security teams

A flaw in the Unix locale system let a local user trick certain library functions into running commands they shouldn't. In practice, a logged-in user on an affected Unix or Linux system could escalate to higher privileges. It affected core system libraries shipped by many vendors in 2000, so patched OS updates from the vendor were the fix. Exposure was limited to multi-user Unix and Linux systems from 2000-era distributions running unpatched glibc or vendor equivalents. Only local, authenticated users could exploit it. Modern, patched systems are not affected. Any surviving legacy hosts (embedded appliances, unmaintained Unix systems) remain the residual concern today. Low priority for modern estates because standard OS patching addressed this over two decades ago. Priority rises to moderate or high only if the organization still operates unpatched legacy Unix systems, embedded devices, or long-lived appliances where users can obtain shell access. Confirm patch status on any remaining legacy hosts. Mitigation focus: Apply the vendor-supplied glibc or locale library patch listed in the advisory for your OS.; Upgrade legacy Unix/Linux hosts still running unpatched 2000-era glibc to a supported release.; Restrict local shell access on multi-user systems to trusted, authenticated users..

Prepared

Jul 11, 2026, 23:58 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.