CVE-2018-18500

high-risk
Published 2019-02-05

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.

Do I need to act?

!
28.2% chance of exploitation in next 30 days
EPSS score — higher than 72% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (18)

Affected Vendors

Debian Redhat Mozilla Canonical

References (34)

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
Third Party Advisory http://www.securityfocus.com/bid/106781
Third Party Advisory 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
Mailing List https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html
Third Party Advisory https://security.gentoo.org/glsa/201903-04
https://security.gentoo.org/glsa/201904-07
Third Party Advisory 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
Vendor 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/
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
Third Party Advisory http://www.securityfocus.com/bid/106781
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:0218
and 14 more references
66
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 15/34 · Moderate
Exposure 19/34 · Moderate