#VU1185 Denial of service in Apache Tomcat - CVE-2016-6817

Vulnerability identifier: #VU1185

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-6817

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Tomcat
Server applications / Web servers

Vendor: Apache Foundation

Description

The vulnerability allows a remote attacker to perform a DoS attack.

The vulnerability exists due to boundary error when parsing HTTP/2 headers. A remote attacker can send a specially crafted HTTP/2 header longer than available buffer and trigger infinite loop.

Successful exploitation of the vulnerability may result in denial of service.

Mitigation
Update to version 9.0.0.M13.

Vulnerable software versions

Apache Tomcat: 9.0.0-M1 - 9.0.0-M11

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External links
https://tomcat.apache.org/security-9.html
https://svn.apache.org/viewvc?view=rev&rev=1765794

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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.