Inconsistent interpretation of HTTP requests in Apache Traffic Server - CVE-2021-32565
Published: June 30, 2021
Vulnerability identifier: #VU54459
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32565
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.
The vulnerability exists due to improper validation of HTTP requests when processing Content-Length header. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.
Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.
Affected software
Apache Traffic Server
trafficserver (Debian package)
trafficserver (Debian package)
How to mitigate CVE-2021-32565
Install updates from vendor's website.
Apache Traffic Server - addressed in versions 8.1.2, 9.0.2
trafficserver (Debian package) - update to 8.0.2+ds-1+deb10u5
trafficserver (Debian package) - update to 8.0.2+ds-1+deb10u5