CVE-2019-11693 — Mozilla: Buffer overflow in WebGL bufferdata on Linux

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CRITICAL

Mozilla: Buffer overflow in WebGL bufferdata on Linux

Published Jul 23, 2019

9.8

CRITICAL

CVSS 3.0

EPSS 2.41%

Description

The bufferdata function in WebGL is vulnerable to a buffer overflow with specific graphics drivers on Linux. This could result in malicious content freezing a tab or triggering a potentially exploitable crash. *Note: this issue only occurs on Linux. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <67
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <60.7
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <60.7

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mozilla

Firefox

n/a

Version	Status	Constraints
unspecified	affected	<67

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<60.7

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<60.7

Red Hat Enterprise Linux 6

firefox-0:60.7.0-1.el6_10

Fixed · RHSA-2019:1267
Red Hat Enterprise Linux 6

thunderbird-0:60.7.0-1.el6_10

Fixed · RHSA-2019:1310
Red Hat Enterprise Linux 7

firefox-0:60.7.0-1.el7_6

Fixed · RHSA-2019:1265
Red Hat Enterprise Linux 7

thunderbird-0:60.7.0-1.el7_6

Fixed · RHSA-2019:1309
Red Hat Enterprise Linux 8

firefox-0:60.7.0-1.el8_0

Fixed · RHSA-2019:1269
Red Hat Enterprise Linux 8

thunderbird-0:60.7.0-1.el8_0

Fixed · RHSA-2019:1308

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox-0:60.7.0-1.el6_10	Fixed	RHSA-2019:1267
Red Hat Enterprise Linux 6	thunderbird-0:60.7.0-1.el6_10	Fixed	RHSA-2019:1310
Red Hat Enterprise Linux 7	firefox-0:60.7.0-1.el7_6	Fixed	RHSA-2019:1265
Red Hat Enterprise Linux 7	thunderbird-0:60.7.0-1.el7_6	Fixed	RHSA-2019:1309
Red Hat Enterprise Linux 8	firefox-0:60.7.0-1.el8_0	Fixed	RHSA-2019:1269
Red Hat Enterprise Linux 8	thunderbird-0:60.7.0-1.el8_0	Fixed	RHSA-2019:1308

Remediation

Red Hat statement

In general, this flaw cannot be exploited through email in Thunderbird because scripting is disabled when reading mail, but it is potentially a risk in browser or browser-like contexts.

Metrics

2.41% 0.02408

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.02408

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (18 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	2.41% (0.02408)	83.51th	v5 (v2026.06.15)
Jun 15, 2026	2.41% (0.02408)	81.87th	v5 (v2026.06.15)
Mar 30, 2025	0.60% (0.00598)	66.88th	v4 (v2025.03.14)
Mar 29, 2025	2.29% (0.02289)	74.47th	v4 (v2025.03.14)
Jul 20, 2024	0.29% (0.00287)	69.13th	v3 (v2023.03.01)
Jul 16, 2024	0.29% (0.00287)	69.10th	v3 (v2023.03.01)
Feb 8, 2024	0.28% (0.00282)	67.66th	v3 (v2023.03.01)
May 27, 2023	0.28% (0.00282)	63.84th	v3 (v2023.03.01)
May 12, 2023	0.29% (0.00291)	64.42th	v3 (v2023.03.01)
Mar 7, 2023	0.24% (0.00243)	60.42th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Sep 10, 2022	1.02% (0.01018)	38.88th	v2 (v2022.01.01)
Apr 1, 2022	1.02% (0.01018)	36.86th	v2 (v2022.01.01)
Feb 4, 2022	18.20% (0.18199)	93.53th	v2 (v2022.01.01)
Feb 3, 2022	4.77% (0.04773)	77.96th	v1
Jan 6, 2022	4.77% (0.04773)	77.75th	v1
Sep 1, 2021	1.10% (0.01105)	66.28th	v1
Apr 14, 2021	1.10% (0.01105)	0.00th	v1

Weaknesses (2)

CWE-120

Classic Buffer Overflow

CWE-787

Out-of-bounds Write

References (9)

https://access.redhat.com/security/cve/CVE-2019-11693
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1532525
x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1712619
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2019-11693
https://www.cve.org/CVERecord?id=CVE-2019-11693
https://www.mozilla.org/en-US/security/advisories/mfsa2019-14/#CVE-2019-11693
https://www.mozilla.org/security/advisories/mfsa2019-13/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/
x_refsource_MISCVendor Advisory

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2019-11693		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1532525		x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1712619		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2019-11693
https://www.cve.org/CVERecord?id=CVE-2019-11693
https://www.mozilla.org/en-US/security/advisories/mfsa2019-14/#CVE-2019-11693
https://www.mozilla.org/security/advisories/mfsa2019-13/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/		x_refsource_MISCVendor Advisory