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Public proof of conceptFix available

CVE-2022-28281

A public proof of concept exists; no exploitation attested.

  • Published2022-12-22
  • Fixed in99.0
  • WeaknessCWE-787

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 a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bounds write would have occurred leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.

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-2022-28281?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-28281?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Mozilla firefox
BranchAffectedFixed in
99.0< 99.099.0
Mozilla firefox esr
BranchAffectedFixed in
91.8< 91.891.8
Mozilla thunderbird
BranchAffectedFixed in
91.8< 91.891.8

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

Products declared by the CNA3 products

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

  • Mozilla Thunderbird
    Affected
    • < 91.8fixed in 91.8custom
  • Mozilla Firefox
    Affected
    • < 99fixed in 99custom
  • Mozilla Firefox ESR
    Affected
    • < 91.8fixed in 91.8custom

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:22.04:LTSall versions · fixed in 1:1snap1-0ubuntu1
  • firefoxUbuntu:20.04:LTSall versions · fixed in 99.0+build2-0ubuntu0.20.04.2
  • firefoxUbuntu:18.04:LTSall versions · fixed in 99.0+build2-0ubuntu0.18.04.2
  • firefoxRocky Linux:8all versions · fixed in 0:91.8.0-1.el8_5and 1 other package
  • firefoxRed Hat:rhel_eus:8.4::appstreamall versions · fixed in 0:91.8.0-1.el8_4and 5 other packages
  • firefoxRed Hat:rhel_eus:8.2::appstreamall versions · fixed in 0:91.8.0-1.el8_2and 5 other packages
  • firefoxRed Hat:rhel_e4s:8.1::appstreamall versions · fixed in 0:91.8.0-1.el8_1and 5 other packages
  • firefoxRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:91.8.0-1.el8_5and 5 other packages

90 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-28281 Red Hat Product Security164 products fixed · 4 known affected

    Mozilla: Out of bounds write due to unexpected WebAuthN Extensions

    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-2022:1326 Red Hat Product Security10 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:1302 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:1305 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:1301 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:1303 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

5 more advisories

Full record on NVD

Fix

  1. Update Mozilla firefox to 99.0
  2. Vendor fix Red Hat Product Security RHSA-2022:1326 · 10 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.
  3. Vendor fix Red Hat Product Security RHSA-2022:1284 · 18 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.

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, unverified0vercl0k/CVE-2022-28281
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-xfm5-pq6w-fhvh

Frequently asked questions

What is CVE-2022-28281?

If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bounds write would have occurred leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.

Is CVE-2022-28281 actively exploited?

Active exploitation of CVE-2022-28281 has not been confirmed. Its EPSS score was 2.8% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-28281?

CVE-2022-28281 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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