CVE-2019-19945: Openwrt

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

uhttpd in OpenWrt through 18.06.5 and 19.x through 19.07.0-rc2 has an integer signedness error. This leads to out-of-bounds access to a heap buffer and a subsequent crash. It can be triggered with an HTTP POST request to a CGI script, specifying both "Transfer-Encoding: chunked" and a large negative Content-Length value.

Affected products

• Openwrt Openwrt: from 18.06.0, up to and including 18.06.5; version 19.07.0 only

Published 2020-03-16. Last modified 2026-06-17.