#VU54461 Input validation error in Apache Traffic Server - CVE-2021-27577

Vulnerability identifier: #VU54461

Vulnerability risk: Medium

CVSSv4.0: 2.7 [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/E:U/U:Green]

CVE-ID: CVE-2021-27577

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Traffic Server
Server applications / Web servers

Vendor: Apache Foundation

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Traffic Server: 7.0.0, 7.1.0 - 7.1.12, 8.0.0 - 8.0.8, 8.1.0 - 8.1.1, 9.0.0 - 9.0.1

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External links
https://lists.apache.org/thread.html/ra1a41ff92a70d25bf576d7da2590575e8ff430393a3f4a0c34de4277%40%3Cusers.trafficserver.apache.org%3E

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.