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Public proof of conceptFix available

CVE-2022-1802

A public proof of concept exists; no exploitation attested.

  • Published2022-12-22
  • Fixed in100.3.0 · 100.0.2
  • WeaknessCWE-1321

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-12-2220:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-1802?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-1802?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Mozilla firefoxversion to verify
BranchAffectedFixed in
100.3< 100.3.0100.3.0
100.0< 100.0.2100.0.2
Mozilla firefox esr
BranchAffectedFixed in
91.9< 91.9.191.9.1
Mozilla thunderbird
BranchAffectedFixed in
91.9< 91.9.191.9.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA4 products

As mozilla, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Mozilla Firefox ESR
    Affected
    • < 91.9.1fixed in 91.9.1custom
  • Mozilla Firefox
    Affected
    • < 100.0.2fixed in 100.0.2custom
  • Mozilla Firefox for Android
    Affected
    • < 100.3.0fixed in 100.3.0custom
  • Mozilla Thunderbird
    Affected
    • < 91.9.1fixed in 91.9.1custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-12-22

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:20.04:LTSall versions · fixed in 100.0.2+build1-0ubuntu0.20.04.1
  • firefoxUbuntu:18.04:LTSall versions · fixed in 100.0.2+build1-0ubuntu0.18.04.1
  • firefoxRocky Linux:8all versions · fixed in 0:91.9.1-1.el8_6and 1 other package
  • firefoxRed Hat:rhel_eus:8.4::appstreamall versions · fixed in 0:91.9.1-1.el8_4and 5 other packages
  • firefoxRed Hat:rhel_eus:8.2::appstreamall versions · fixed in 0:91.9.1-1.el8_2and 5 other packages
  • firefoxRed Hat:rhel_e4s:8.1::appstreamall versions · fixed in 0:91.9.1-1.el8_1and 5 other packages
  • firefoxRed Hat:enterprise_linux:9::appstreamall versions · fixed in 0:91.9.1-1.el9_0and 5 other packages
  • firefoxRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:91.9.1-1.el8_6and 5 other packages

90 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-1802 Red Hat Product Security190 products fixed · 4 known affected

    Mozilla: Prototype pollution in Top-Level Await implementation

    firefox as a component of Red Hat Enterprise Linux 6 · firefox.src as a component of Red Hat Enterprise Linux 6 · thunderbird as a component of Red Hat Enterprise Linux 6 · +1 more

  • RHSA-2022:4776 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: firefox security update

  • RHSA-2022:4769 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:4765 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: firefox security update

  • RHSA-2022:4768 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: firefox security update

  • RHSA-2022:4772 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

7 more advisories

Full record on NVD

Fix

  1. Update Mozilla firefox to 100.3.0 · 100.0.2
  2. Vendor fix Red Hat Product Security RHSA-2022:4776 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.
  3. Vendor fix Red Hat Product Security RHSA-2022:4769 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedmistymntncop/CVE-2022-1802
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2022-12-22
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-p859-wprc-3cjx

Frequently asked questions

What is CVE-2022-1802?

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.

Is CVE-2022-1802 actively exploited?

A proof-of-concept exploit exists for CVE-2022-1802, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2022-1802?

CVE-2022-1802 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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