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Vulnerability record · CVE-2018-18500 · published 5 February 2019

CVE-2018-18500: Mozilla firefox use after free vulnerability

Mozilla · Firefox

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.

9.8 CVSS 3.0 Critical EPSS 13% · top 3.9% CWE-416 · Use after free
9.8CVSS 3.0 base score, v2 7.5
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
11Affected product versions listed by NVD
34References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

11 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
http://www.securityfocus.com/bid/106781 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0218 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0219 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0269 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0270 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201903-04 Third Party Advisory
https://security.gentoo.org/glsa/201904-07
https://usn.ubuntu.com/3874-1/ Third Party Advisory
https://usn.ubuntu.com/3897-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4376 Third Party Advisory
https://www.debian.org/security/2019/dsa-4392 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-01/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-02/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-03/ Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
http://www.securityfocus.com/bid/106781 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0218 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0219 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0269 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0270 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201903-04 Third Party Advisory
https://security.gentoo.org/glsa/201904-07
https://usn.ubuntu.com/3874-1/ Third Party Advisory
https://usn.ubuntu.com/3897-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4376 Third Party Advisory
https://www.debian.org/security/2019/dsa-4392 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-01/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-02/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-03/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-18500), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.