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CVE-2018-12377

30
FAUCET Score

CVE-2018-12377 is a critical use-after-free vulnerability affecting Firefox versions prior to 62, Firefox ESR prior to 60.2, and Thunderbird prior to 60.2.1, where refresh driver timers can be improperly refreshed during shutdown, leading to a potentially exploitable crash. With a CVSS score of 9.8, this vulnerability is highly severe, allowing for remote, low-complexity attacks with high impacts on confidentiality, integrity, and availability. Despite its critical rating, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
7.6CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.36%
Probability of exploitation in next 30 days
EPSS Percentile
87.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0336 is in the 80th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:60.2.0-1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:60.2.1-5.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:60.2.0-1.el7_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:60.2.1-4.el7_5
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2018-12377Important

Mozilla: Use-after-free in driver timers

Sep 5, 2018

References

access.redhat.com / errata/RHSA-2018:2692
Third Party Advisory
access.redhat.com / errata/RHSA-2018:2693
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3403
Third Party Advisory
access.redhat.com / errata/RHSA-2018:3458
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPermissions RequiredVendor Advisory
lists.debian.org / debian-lts-announce/2018/11/msg00011.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201810-01
Third Party Advisory
security.gentoo.org / glsa/201811-13
Third Party Advisory
usn.ubuntu.com / 3761-1
Third Party Advisory
usn.ubuntu.com / 3793-1
Third Party Advisory
debian.org / security/2018/dsa-4287
Third Party Advisory
debian.org / security/2018/dsa-4327
Third Party Advisory
mozilla.org / security/advisories/mfsa2018-20
Vendor Advisory
mozilla.org / security/advisories/mfsa2018-21
Vendor Advisory
mozilla.org / security/advisories/mfsa2018-25
Vendor Advisory
securityfocus.com / bid/105280
Third Party AdvisoryVDB Entry
securitytracker.com / id/1041610
Third Party AdvisoryVDB Entry