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CVE-2019-18277

7.5 · HIGH

A flaw was found in HAProxy before 2.0.6.

Published Oct 23, 2019CWE-444EPSS 10.07%

Overview

CVE-2019-18277 is a high-severity vulnerability. It was published on October 23, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2019-12/msg00016.htmlReflists.opensuse.org/opensuse-security-announce/2019-12/msg00019.htmlRefgit.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581Reflists.debian.org/debian-lts-announce/2022/05/msg00045.htmlRefnathandavison.com/blog/haproxy-http-request-smugglingRefusn.ubuntu.com/4174-1/Refwww.mail-archive.com/haproxy%40formilux.org/msg34926.htmlReflists.opensuse.org/opensuse-security-announce/2019-12/msg00016.htmlReflists.opensuse.org/opensuse-security-announce/2019-12/msg00019.htmlRefgit.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581

How CyberStrike helps

Frequently asked questions

What is CVE-2019-18277?

CVE-2019-18277 is a high-severity vulnerability. It was published on October 23, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-18277?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-18277?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-18277?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-18277 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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