Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2018-20721

9.8 · CRITICAL

URI_FUNC() in UriParse.c in uriparser before 0.9.1 has an out-of-bounds read (in uriParse*Ex* functions) for an incomplete URI with an IPv6 address containing an embedded IPv4 address, such as a "/…

Published Jan 16, 2019CWE-125EPSS 2.05%

Overview

CVE-2018-20721 is a critical-severity vulnerability. It was published on January 16, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

URI_FUNC() in UriParse.c in uriparser before 0.9.1 has an out-of-bounds read (in uriParse*Ex* functions) for an incomplete URI with an IPv6 address containing an embedded IPv4 address, such as a "//[::44.1" address.

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

GitHubgithub.com/uriparser/uriparser/blob/master/ChangeLogGitHubgithub.com/uriparser/uriparser/commit/cef25028de5ff872c2e1f0a6c562eb3ea9ecbce4Reflists.debian.org/debian-lts-announce/2019/02/msg00028.htmlReflists.debian.org/debian-lts-announce/2021/11/msg00029.htmlGitHubgithub.com/uriparser/uriparser/blob/master/ChangeLogGitHubgithub.com/uriparser/uriparser/commit/cef25028de5ff872c2e1f0a6c562eb3ea9ecbce4Reflists.debian.org/debian-lts-announce/2019/02/msg00028.htmlReflists.debian.org/debian-lts-announce/2021/11/msg00029.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20721?

CVE-2018-20721 is a critical-severity vulnerability. It was published on January 16, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2018-20721?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-20721?

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-2018-20721?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20721 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.

Related CRITICAL CVEs from 2018

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999