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CVE-2019-9818

21
FAUCET Score

CVE-2019-9818 describes a race condition in the crash generation server of Mozilla Firefox, Firefox ESR, and Thunderbird on Windows, leading to a use-after-free vulnerability. This high-severity flaw, with a CVSS score of 8.3, could result in a potentially exploitable crash and a sandbox escape, allowing an attacker to achieve high impact on confidentiality, integrity, and availability with high attack complexity and user interaction. Despite its severity, there is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), it is not listed in CISA's KEV catalog, and it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 67.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 60.7CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
< 60.7CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.3HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.95%
Probability of exploitation in next 30 days
EPSS Percentile
57.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0095 is in the 44th percentile among its peer group of 1,572 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.4 Bluesky, 0.2 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.6 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2019-9818Important

Mozilla: Use-after-free in crash generation server

May 22, 2019

References

bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPermissions Required
mozilla.org / security/advisories/mfsa2019-13
Vendor Advisory
mozilla.org / security/advisories/mfsa2019-14
Vendor Advisory
mozilla.org / security/advisories/mfsa2019-15
Vendor Advisory