Input validation error in Apache Traffic Server - CVE-2021-27577

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Main Vulnerability Database Vulnerabilities #VU54461

Input validation error in Apache Traffic Server - CVE-2021-27577

Published: June 30, 2021


Vulnerability identifier: #VU54461
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-2021-27577
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to poison web server cache.

The vulnerability exists due to insufficient validation of user-supplied input when handling URL fragmentation. A remote attacker can send specially crafted HTTP request and poison the web server cache.


Affected software

Apache Traffic Server
trafficserver (Debian package)

How to mitigate CVE-2021-27577

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

External References

Related Security Bulletins