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CVE-2018-18500
CRITICAL
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.
Published: Feb 5, 2019
Modified: Jun 17, 2026
CWE-416
CVSS Metrics
CVSSv3
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products (18)
| Vendor | Product | Version |
|---|---|---|
| mozilla | firefox | * < 65.0 |
| mozilla | firefox_esr | * < 60.5 |
| mozilla | thunderbird | * < 60.5 |
| canonical | ubuntu_linux | 14.04 |
| canonical | ubuntu_linux | 16.04 |
| canonical | ubuntu_linux | 18.04 |
| canonical | ubuntu_linux | 18.10 |
| debian | debian_linux | 8.0 |
| debian | debian_linux | 9.0 |
| redhat | enterprise_linux_desktop | 6.0 |
| redhat | enterprise_linux_desktop | 7.0 |
| redhat | enterprise_linux_server | 6.0 |
| redhat | enterprise_linux_server | 7.0 |
| redhat | enterprise_linux_server_aus | 7.6 |
| redhat | enterprise_linux_server_eus | 7.6 |
| redhat | enterprise_linux_server_tus | 7.6 |
| redhat | enterprise_linux_workstation | 6.0 |
| redhat | enterprise_linux_workstation | 7.0 |
GitHub Security Advisory GHSA-6hxm-h9g7-cg3m
A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom...
References (34)
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
- http://www.securityfocus.com/bid/106781 Third Party Advisory, VDB 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 List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html Mailing List, Third 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
Risk Scores
CVSS Score
9.8 / 10
EPSS Score
12.66%
Top 4% most likely to be exploited
Threat Score
43 / 100
Data Sources
NVD
EPSS
GitHub