CVE-2025-8033: Incorrect JavaScript state machine for generators

Published Jul 22, 2025
·
Updated

The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref.

Affected Software

14 affected componentsFixes available
Mozilla Firefox ESR<115.26
115.26
Mozilla Firefox<141
141
Mozilla Firefox ESR<128.13
128.13
Mozilla Firefox ESR<140.1
140.1
Mozilla Thunderbird<128.13
128.13
Mozilla Thunderbird<141
141
Mozilla Thunderbird<140.1
140.1
Mozilla Firefox<115.26.0
Mozilla Firefox<141.0
Mozilla Firefox>=128.0<128.13.0
Mozilla Firefox>=140.0<140.1.0
Mozilla Thunderbird<128.13.0
Mozilla Thunderbird<141.0
Mozilla Thunderbird>=140.0<140.1.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 115.26
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 128.13
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 140.1
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 141
  5. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 141
  6. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.26
  7. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 128.13
  8. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.1
  9. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 141
  10. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 128.13
  11. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.1

Event History

Jul 22, 2025
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·08:49 PM
Data Sourced
via MITRE·08:49 PM
Description
Data Sourced
via Red Hat·09:02 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·09:15 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2025-8033?

CVE-2025-8033 is classified as a moderate severity vulnerability due to the potential for a null pointer dereference leading to application crashes.

2

How do I fix CVE-2025-8033?

To fix CVE-2025-8033, update affected versions of Mozilla Firefox and Firefox ESR to the latest patched versions.

3

Which versions of Firefox are affected by CVE-2025-8033?

CVE-2025-8033 affects Firefox versions up to 141 and Firefox ESR versions up to 115.26.

4

What type of vulnerability is CVE-2025-8033?

CVE-2025-8033 is a JavaScript engine vulnerability related to improper handling of closed generators.

5

Can CVE-2025-8033 be exploited remotely?

CVE-2025-8033 has the potential for remote exploitation as it can lead to application crashes.

Company

Resources

Contact

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