HOMEVULNERABILITIESCVE-2019-9788
CRITICAL

CVE-2019-9788

CWE-787Published: April 26, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Mozilla developers and community members reported memory safety bugs present in Firefox 65, Firefox ESR 60.5, and Thunderbird 60.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

NVD Source

Technical Analysis

CVE-2019-9788 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Mozilla2 product(s)
firefoxthunderbird
Red Hat4 product(s)
enterprise linuxenterprise linux eusenterprise linux server ausenterprise linux server tus
Source: NVD CPE · 10 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0966
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1144
ADVISORYhttps://bugzilla.mozilla.org/buglist.cgi?bug_id=1518001%2C1521304%2C1521214%2C1506665%2C1516834%2C1518774%2C1524755%2C1523362%2C1524214%2C1529203
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2019-07/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2019-08/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2019-11/
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0966
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1144
ADVISORYhttps://bugzilla.mozilla.org/buglist.cgi?bug_id=1518001%2C1521304%2C1521214%2C1506665%2C1516834%2C1518774%2C1524755%2C1523362%2C1524214%2C1529203
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2019-07/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2019-08/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2019-11/

All References (12)

→
https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
→
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1518001%2C1521304%2C1521214%2C1506665%2C1516834%2C1518774%2C1524755%2C1523362%2C1524214%2C1529203Issue Tracking · Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2019-08/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2019-11/Vendor Advisory
→
https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
→
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1518001%2C1521304%2C1521214%2C1506665%2C1516834%2C1518774%2C1524755%2C1523362%2C1524214%2C1529203Issue Tracking · Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2019-08/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2019-11/Vendor Advisory

Quick Facts

CVE IDCVE-2019-9788
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-787
CISA KEVNo
Affected2 vendor(s)
PublishedApr 26, 2019

Related CVEs (CWE-787)

CVE-2004-0978
10.0
CVE-2013-5610
10.0
CVE-2026-42369
10.0
CVE-2002-2227
10.0
CVE-2011-1807
10.0
CVE-2019-6235
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-9788 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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