HOME VULNERABILITIESCVE-2022-31736

CRITICAL

CVE-2022-31736

NVD-CWE-noinfoPublished: December 22, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A malicious website could have learned the size of a cross-origin resource that supported Range requests. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Risk Analysis

This vulnerability allows a malicious website to determine the size of cross-origin resources that support Range requests. While this is an information disclosure issue, it is rated as critical due to the potential for cross-origin data leakage.

There is no known public exploit, and it is not in the KEV database. The flaw is remotely exploitable.

Recommended Action

Update to Firefox 101, Firefox ESR 91.10, or Thunderbird 91.10 to address the cross-origin resource handling.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2022-31736 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Mozilla3 product(s)

firefoxfirefox esrthunderbird

Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://bugzilla.mozilla.org/show_bug.cgi?id=1735923

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2022-20/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2022-21/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2022-22/

ADVISORYhttps://bugzilla.mozilla.org/show_bug.cgi?id=1735923

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2022-20/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2022-21/

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2022-22/

All References (8)

→

https://bugzilla.mozilla.org/show_bug.cgi?id=1735923Issue Tracking · Permissions Required · Vendor Advisory

→

https://www.mozilla.org/security/advisories/mfsa2022-20/Vendor Advisory

→

https://www.mozilla.org/security/advisories/mfsa2022-21/Vendor Advisory

→

https://www.mozilla.org/security/advisories/mfsa2022-22/Vendor Advisory

→

https://bugzilla.mozilla.org/show_bug.cgi?id=1735923Issue Tracking · Permissions Required · Vendor Advisory

→

https://www.mozilla.org/security/advisories/mfsa2022-20/Vendor Advisory

→

https://www.mozilla.org/security/advisories/mfsa2022-21/Vendor Advisory

→

https://www.mozilla.org/security/advisories/mfsa2022-22/Vendor Advisory

Quick Facts

CVE IDCVE-2022-31736

CVSS Score9.8 / 10

SeverityCRITICAL

WeaknessNVD-CWE-noinfo

CISA KEVNo

Affected1 vendor(s)

PublishedDec 22, 2022

Related CVEs (NVD-CWE-noinfo)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2022-31736 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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