#VU18067 Resource exhaustion in Apache Tomcat - CVE-2019-0199

Vulnerability identifier: #VU18067

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-2019-0199

CWE-ID: CWE-400

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 denial of service (DoS) attack.

The vulnerability exists within the HTTP/2 implementation in Apache Tomcat that accepts streams with excessive numbers of SETTINGS frames and also permits clients to keep streams open without reading/writing request/response data. A remote attacker can exhaust all available threads on the server and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Tomcat: 8.5.0 - 8.5.37, 9.0.0-M1 - 9.0.14

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External links
https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.16

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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.