Apache HTTP Server: mod_proxy prior to 2.4.55 allows a backend to trigger HTTP response splitting
25Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 58%
exploitation probability
58%top 1% of all CVEs
observed exploitation
nono source reports it
Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
Apache Software Foundation · Apache HTTP Server