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Vulnerability details: VCID-e2yv-h5qe-9kc2
Vulnerability ID VCID-e2yv-h5qe-9kc2
Aliases CVE-2019-11764
Summary Mozilla developers and community members Bob Clary, Jason Kratzer, Aaron Klotz, Iain Ireland, Tyson Smith, Christian Holler, Steve Fink, Honza Bambas, Byron Campen, and Cristian Brindusan reported memory safety bugs present in Firefox 69 and Firefox ESR 68.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could be exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11764.json
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
epss 0.01071 https://api.first.org/data/v1/epss?cve=CVE-2019-11764
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11764
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11764
archlinux Critical https://security.archlinux.org/AVG-1054
archlinux Critical https://security.archlinux.org/AVG-1055
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-33
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-34
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-35
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11764.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11764
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1558522%2C1577061%2C1548044%2C1571223%2C1573048%2C1578933%2C1575217%2C1583684%2C1586845%2C1581950%2C1583463%2C1586599
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11755
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11757
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11759
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11760
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11761
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11762
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11763
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11764
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15903
https://security.gentoo.org/glsa/202003-10
https://www.mozilla.org/security/advisories/mfsa2019-33/
https://www.mozilla.org/security/advisories/mfsa2019-35/
1764446 https://bugzilla.redhat.com/show_bug.cgi?id=1764446
ASA-201910-15 https://security.archlinux.org/ASA-201910-15
ASA-201910-16 https://security.archlinux.org/ASA-201910-16
AVG-1054 https://security.archlinux.org/AVG-1054
AVG-1055 https://security.archlinux.org/AVG-1055
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
CVE-2019-11764 https://nvd.nist.gov/vuln/detail/CVE-2019-11764
mfsa2019-33 https://www.mozilla.org/en-US/security/advisories/mfsa2019-33
mfsa2019-34 https://www.mozilla.org/en-US/security/advisories/mfsa2019-34
mfsa2019-35 https://www.mozilla.org/en-US/security/advisories/mfsa2019-35
RHSA-2019:3193 https://access.redhat.com/errata/RHSA-2019:3193
RHSA-2019:3196 https://access.redhat.com/errata/RHSA-2019:3196
RHSA-2019:3210 https://access.redhat.com/errata/RHSA-2019:3210
RHSA-2019:3237 https://access.redhat.com/errata/RHSA-2019:3237
RHSA-2019:3281 https://access.redhat.com/errata/RHSA-2019:3281
RHSA-2019:3756 https://access.redhat.com/errata/RHSA-2019:3756
USN-4165-1 https://usn.ubuntu.com/4165-1/
USN-4202-1 https://usn.ubuntu.com/4202-1/
USN-4335-1 https://usn.ubuntu.com/4335-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11764.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11764
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11764
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.76825
EPSS Score 0.01071
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:57.582312+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-33.yml 37.0.0