CVE-2018-19791: Litespeedtech Openlitespeed

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

The server in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 does not correctly handle requests for byte sequences, allowing an attacker to amplify the response size by requesting the entire response body repeatedly, as demonstrated by an HTTP Range header value beginning with the "bytes=0-,0-" substring.

Affected products

• Litespeedtech Openlitespeed: before 1.5.0 (fixed in 1.5.0); version 1.5.0 only

Published 2018-12-03. Last modified 2026-06-17.