CVE-2022-28281

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-12-22. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
83.4%
KEV
Not listed

Published

December 22, 2022

Last Modified

April 15, 2025

References (8)

Vendor Advisories for CVE-2022-28281(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-locale-ast (99.0+build2-0ubuntu0.21.10.2) @ impish2026-05-25ubuntu
ubuntuthunderbird-locale-id (1:91.8.1+build1-0ubuntu0.18.04.1) @ bionic2026-05-25ubuntu
redhatthunderbird-0:91.8.0-1.el8_22022-04-12redhat
redhatthunderbird-0:91.8.0-1.el8_42022-04-11redhat
redhatthunderbird-0:91.8.0-1.el7_92022-04-11redhat
redhatthunderbird-0:91.8.0-1.el8_52022-04-11redhat
redhatthunderbird-0:91.8.0-1.el8_12022-04-11redhat
redhatfirefox-0:91.8.0-1.el8_22022-04-08redhat
redhatfirefox-0:91.8.0-1.el8_12022-04-08redhat
redhatfirefox-0:91.8.0-1.el8_42022-04-08redhat
redhatfirefox-0:91.8.0-1.el7_92022-04-08redhat
redhatfirefox-0:91.8.0-1.el8_52022-04-08redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(10)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-07-23 02:10 UTCEG score recompute
  2. 2026-07-22 22:57 UTCEG score recompute
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC0vercl0k/CVE-2022-28281
    First seen Apr 8, 2022

    PoC for CVE-2022-28281 a Mozilla Firefox Out of bounds write.

    Open source ↗

Frequently asked(5)

What is CVE-2022-28281?
CVE-2022-28281 is a high vulnerability published on December 22, 2022. 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,…
When was CVE-2022-28281 disclosed?
CVE-2022-28281 was first published in the National Vulnerability Database on December 22, 2022, with the most recent update on April 15, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-28281 actively exploited?
CVE-2022-28281 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-28281?
CVE-2022-28281 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2022-28281?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-28281, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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