CVE-2018-5099

Name: CVE-2018-5099
Creator: NVD / NIST
Published: 2018-06-11T21:29:12.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.07%

Last modified Jun 17, 2026

CVE-2018-5099 is a vulnerability of currently unknown severity. A use-after-free vulnerability can occur when the widget listener is holding strong references to browser objects that have previously been freed, resulting in a potentially exploitable crash when these references are used. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.. EPSS estimates a 3.07% chance of exploitation in the next 30 days.

Description

A use-after-free vulnerability can occur when the widget listener is holding strong references to browser objects that have previously been freed, resulting in a potentially exploitable crash when these references are used. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.

Metrics

EPSS Probability

3.07%

85.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Debian	Debian Linux	7.0
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	7.4
Redhat	Enterprise Linux Server Eus	7.4
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0
Mozilla	Firefox	< 58.0
Mozilla	Firefox	< 52.6.0
Mozilla	Thunderbird	< 52.6.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	17.10

References

http://www.securityfocus.com/bid/102783Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040270Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:0122Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0262Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1416878Issue Tracking, Permissions Required, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/01/msg00030.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/01/msg00036.htmlThird Party Advisory
https://usn.ubuntu.com/3544-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4096Third Party Advisory
https://www.debian.org/security/2018/dsa-4102Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-03/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-04/Vendor Advisory
http://www.securityfocus.com/bid/102783Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040270Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:0122Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0262Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1416878Issue Tracking, Permissions Required, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/01/msg00030.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/01/msg00036.htmlThird Party Advisory
https://usn.ubuntu.com/3544-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4096Third Party Advisory
https://www.debian.org/security/2018/dsa-4102Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-03/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-04/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5099?

How severe is CVE-2018-5099?

Severity scoring for CVE-2018-5099 is pending analysis. The EPSS model estimates a 3.07% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5099?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-5099?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST