HOMEVULNERABILITIESCVE-2025-8037
CRITICAL

CVE-2025-8037

CWE-614Published: July 22, 2025· Updated: Jun 17, 2026

9.1
CVSS v3.1

Official Description

Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the `Secure` attribute. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

NVD Source

Technical Analysis

CVE-2025-8037 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), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Vendors & Products

Mozilla2 product(s)
firefoxthunderbird
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-56/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-59/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-61/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-63/

All References (5)

→
https://bugzilla.mozilla.org/show_bug.cgi?id=1964767Permissions Required
→
https://www.mozilla.org/security/advisories/mfsa2025-56/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-59/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-61/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-63/Vendor Advisory

Quick Facts

CVE IDCVE-2025-8037
CVSS Score9.1 / 10
SeverityCRITICAL
WeaknessCWE-614
CISA KEVNo
Affected1 vendor(s)
PublishedJul 22, 2025

Related CVEs (CWE-614)

CVE-2026-46398
8.8
CVE-2026-53661
8.8
CVE-2025-53757
8.7
CVE-2025-0479
8.6
CVE-2020-27651
8.1
CVE-2022-3174
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2025-8037 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.COM. CVE data is provided under the NVD usage policy.
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