CVE-2018-18500

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 41.87% Top 5%
Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory gentoo.org Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory debian.org Vendor Advisory debian.org Vendor Advisory redhat.com Vendor Advisory gentoo.org Vendor Advisory opensuse.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2019:0219 third party advisory vendor advisory
https://www.mozilla.org/security/advisories/mfsa2019-01/ vendor advisory
https://usn.ubuntu.com/3897-1/ third party advisory vendor advisory
http://www.securityfocus.com/bid/106781 vdb entry third party advisory
https://security.gentoo.org/glsa/201903-04 third party advisory vendor advisory
https://usn.ubuntu.com/3874-1/ third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:0269 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:0218 third party advisory vendor advisory
https://www.mozilla.org/security/advisories/mfsa2019-02/ vendor advisory
https://www.debian.org/security/2019/dsa-4376 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html third party advisory mailing list
https://www.mozilla.org/security/advisories/mfsa2019-03/ vendor advisory
https://www.debian.org/security/2019/dsa-4392 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:0270 third party advisory vendor advisory
https://security.gentoo.org/glsa/201904-07 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-18500?
CVE-2018-18500 has been scored as a critical severity vulnerability.
How to fix CVE-2018-18500?
To fix CVE-2018-18500, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-18500 being actively exploited in the wild?
It is possible that CVE-2018-18500 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~42% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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