CVE-2022-1802 — Mozilla: Prototype pollution in Top-Level Await implementation

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HIGH

Mozilla: Prototype pollution in Top-Level Await implementation

Published Dec 22, 2022

8.8

HIGH

CVSS 3.1

EPSS 26.71%

Description

If an attacker was able to corrupt the methods of an Array object in JavaScript via prototype pollution, they could have achieved execution of attacker-controlled JavaScript code in a privileged context. This vulnerability affects Firefox ESR < 91.9.1, Firefox < 100.0.2, Firefox for Android < 100.3.0, and Thunderbird < 91.9.1.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <100.0.2
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <91.9.1
Vendor Mozilla Product Firefox for Android Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <100.3.0
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <91.9.1

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	<100.0.2

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<91.9.1

Mozilla

Firefox for Android

n/a

Version	Status	Constraints
unspecified	affected	<100.3.0

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<91.9.1

Red Hat Enterprise Linux 7

firefox-0:91.9.1-1.el7_9

Fixed · RHSA-2022:4729
Red Hat Enterprise Linux 7

thunderbird-0:91.9.1-1.el7_9

Fixed · RHSA-2022:4730
Red Hat Enterprise Linux 8

firefox-0:91.9.1-1.el8_6

Fixed · RHSA-2022:4776
Red Hat Enterprise Linux 8

thunderbird-0:91.9.1-1.el8_6

Fixed · RHSA-2022:4769
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions

firefox-0:91.9.1-1.el8_1

Fixed · RHSA-2022:4767
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions

thunderbird-0:91.9.1-1.el8_1

Fixed · RHSA-2022:4770
Red Hat Enterprise Linux 8.2 Extended Update Support

firefox-0:91.9.1-1.el8_2

Fixed · RHSA-2022:4768
Red Hat Enterprise Linux 8.2 Extended Update Support

thunderbird-0:91.9.1-1.el8_2

Fixed · RHSA-2022:4773
Red Hat Enterprise Linux 8.4 Extended Update Support

firefox-0:91.9.1-1.el8_4

Fixed · RHSA-2022:4766
Red Hat Enterprise Linux 8.4 Extended Update Support

thunderbird-0:91.9.1-1.el8_4

Fixed · RHSA-2022:4774
Red Hat Enterprise Linux 9

firefox-0:91.9.1-1.el9_0

Fixed · RHSA-2022:4765
Red Hat Enterprise Linux 9

thunderbird-0:91.9.1-1.el9_0

Fixed · RHSA-2022:4772
Red Hat Enterprise Linux 6

firefox

Out of support scope
Red Hat Enterprise Linux 6

thunderbird

Out of support scope

Product	Package	State	Advisory
Red Hat Enterprise Linux 7	firefox-0:91.9.1-1.el7_9	Fixed	RHSA-2022:4729
Red Hat Enterprise Linux 7	thunderbird-0:91.9.1-1.el7_9	Fixed	RHSA-2022:4730
Red Hat Enterprise Linux 8	firefox-0:91.9.1-1.el8_6	Fixed	RHSA-2022:4776
Red Hat Enterprise Linux 8	thunderbird-0:91.9.1-1.el8_6	Fixed	RHSA-2022:4769
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions	firefox-0:91.9.1-1.el8_1	Fixed	RHSA-2022:4767
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions	thunderbird-0:91.9.1-1.el8_1	Fixed	RHSA-2022:4770
Red Hat Enterprise Linux 8.2 Extended Update Support	firefox-0:91.9.1-1.el8_2	Fixed	RHSA-2022:4768
Red Hat Enterprise Linux 8.2 Extended Update Support	thunderbird-0:91.9.1-1.el8_2	Fixed	RHSA-2022:4773
Red Hat Enterprise Linux 8.4 Extended Update Support	firefox-0:91.9.1-1.el8_4	Fixed	RHSA-2022:4766
Red Hat Enterprise Linux 8.4 Extended Update Support	thunderbird-0:91.9.1-1.el8_4	Fixed	RHSA-2022:4774
Red Hat Enterprise Linux 9	firefox-0:91.9.1-1.el9_0	Fixed	RHSA-2022:4765
Red Hat Enterprise Linux 9	thunderbird-0:91.9.1-1.el9_0	Fixed	RHSA-2022:4772
Red Hat Enterprise Linux 6	firefox	Out of support scope	n/a
Red Hat Enterprise Linux 6	thunderbird	Out of support scope	n/a

Remediation

No remediation recorded yet.

Metrics

26.71% 0.26709

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

EPSS probability 0.26709

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (25 key points)

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

Date	Score	Percentile	Model
Oct 3, 2026	26.71% (0.26709)	97.97th	v5 (v2026.06.15)
Jun 15, 2026	26.71% (0.26709)	97.76th	v5 (v2026.06.15)
Mar 17, 2026	67.93% (0.67932)	98.56th	v4 (v2025.03.14)
Feb 22, 2026	66.27% (0.66274)	98.48th	v4 (v2025.03.14)
Nov 21, 2025	63.83% (0.63835)	98.32th	v4 (v2025.03.14)
Nov 18, 2025	54.87% (0.54871)	97.95th	v4 (v2025.03.14)
Oct 19, 2025	63.83% (0.63835)	98.32th	v4 (v2025.03.14)
Mar 30, 2025	69.17% (0.69171)	98.53th	v4 (v2025.03.14)
Mar 29, 2025	76.84% (0.76838)	98.64th	v4 (v2025.03.14)
Mar 28, 2025	69.17% (0.69171)	98.53th	v4 (v2025.03.14)
Mar 27, 2025	76.84% (0.76838)	98.87th	v4 (v2025.03.14)
Mar 20, 2025	69.17% (0.69171)	98.57th	v4 (v2025.03.14)
Mar 19, 2025	76.84% (0.76838)	98.89th	v4 (v2025.03.14)
Mar 17, 2025	69.17% (0.69171)	98.53th	v4 (v2025.03.14)
Dec 17, 2024	1.98% (0.01975)	88.45th	v3 (v2023.03.01)
Jul 14, 2024	0.25% (0.00246)	64.97th	v3 (v2023.03.01)
Jun 3, 2024	0.27% (0.00275)	68.08th	v3 (v2023.03.01)
Jan 24, 2024	0.24% (0.00245)	62.58th	v3 (v2023.03.01)
Dec 29, 2023	0.21% (0.00210)	58.91th	v3 (v2023.03.01)
Nov 22, 2023	0.17% (0.00168)	53.57th	v3 (v2023.03.01)
Jul 8, 2023	0.14% (0.00145)	49.41th	v3 (v2023.03.01)
Mar 7, 2023	0.17% (0.00167)	51.64th	v3 (v2023.03.01)
Mar 6, 2023	16.66% (0.16660)	96.16th	v2 (v2022.01.01)
Dec 30, 2022	16.66% (0.16660)	95.98th	v2 (v2022.01.01)
Dec 23, 2022	3.37% (0.03370)	84.07th	v2 (v2022.01.01)

Weaknesses (2)

CWE-1321

CWE-843

References (7)

https://access.redhat.com/security/cve/CVE-2022-1802
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1770137
exploitIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2089217
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2022-1802
https://www.cve.org/CVERecord?id=CVE-2022-1802
https://www.mozilla.org/en-US/security/advisories/mfsa2022-19/#CVE-2022-1802
https://www.mozilla.org/security/advisories/mfsa2022-19/
Vendor Advisory

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2022-1802		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1770137		exploitIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2089217		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2022-1802
https://www.cve.org/CVERecord?id=CVE-2022-1802
https://www.mozilla.org/en-US/security/advisories/mfsa2022-19/#CVE-2022-1802
https://www.mozilla.org/security/advisories/mfsa2022-19/		Vendor Advisory