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CVE-2018-18500

9.8 · CRITICAL

A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements.

Published Feb 5, 2019CWE-416EPSS 12.66%

Overview

CVE-2018-18500 is a critical-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.0 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

A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.

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/2019-07/msg00021.htmlRefwww.securityfocus.com/bid/106781Refaccess.redhat.com/errata/RHSA-2019:0218Refaccess.redhat.com/errata/RHSA-2019:0219Refaccess.redhat.com/errata/RHSA-2019:0269Refaccess.redhat.com/errata/RHSA-2019:0270Reflists.debian.org/debian-lts-announce/2019/01/msg00025.htmlReflists.debian.org/debian-lts-announce/2019/02/msg00024.htmlRefsecurity.gentoo.org/glsa/201903-04Refsecurity.gentoo.org/glsa/201904-07

How CyberStrike helps

Frequently asked questions

What is CVE-2018-18500?

CVE-2018-18500 is a critical-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

How severe is CVE-2018-18500?

This vulnerability has a CVSS 3.0 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-2018-18500?

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-2018-18500?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-18500 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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