JavaScript Engine Vulnerability in Firefox and Thunderbird
CVE-2025-8033

6.5MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
22 July 2025

What is CVE-2025-8033?

This vulnerability occurs in the JavaScript engine, where closed generators are improperly handled, allowing them to be resumed unintentionally. This leads to potential null pointer dereference scenarios, which could allow an attacker to exploit this condition and affect the stability and security of the affected products. Users of Firefox and Thunderbird are advised to update to the latest versions to mitigate this risk.

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Affected Version(s)

Firefox < 141

Firefox ESR < 115.26

Firefox ESR < 128.13

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1973990
https://www.mozilla.org/security/advisories/mfsa2025-56/
https://www.mozilla.org/security/advisories/mfsa2025-57/

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Shaheen Fazim
JSON
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