CVE-2025-0247: Memory safety bugs fixed in Firefox 134 and Thunderbird 134

Published Jan 7, 2025
·
Updated

Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 134 and Thunderbird 134.

Affected Software

16 affected componentsFixes available
Mozilla Thunderbird<134
134
Mozilla Firefox<134.0
Mozilla Thunderbird<134.0
ubuntu/mozjs52*
ubuntu/mozjs38*
ubuntu/firefox<134.0+build1-0ubuntu0.20.04.1
134.0+build1-0ubuntu0.20.04.1
ubuntu/mozjs68*
ubuntu/mozjs52*
ubuntu/mozjs102*
ubuntu/mozjs78*
ubuntu/mozjs91*
ubuntu/thunderbird<1:140.7.1+build1-0ubuntu0.22.04.1
1:140.7.1+build1-0ubuntu0.22.04.1
ubuntu/mozjs102*
ubuntu/mozjs115*
Mozilla Firefox<134
134
debian/firefox
159.0-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 134
  2. Upgrade

    Upgrade ubuntu/firefox to a version that resolves this vulnerability.

    Fixed in 134.0+build1-0ubuntu0.20.04.1
  3. Upgrade

    Upgrade ubuntu/thunderbird to a version that resolves this vulnerability.

    Fixed in 1:140.7.1+build1-0ubuntu0.22.04.1
  4. Upgrade

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

    Fixed in 134
  5. Upgrade

    Upgrade debian/firefox to a version that resolves this vulnerability.

    Fixed in 159.0-1
  6. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 134

Event History

Jan 7, 2025
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
CVE Published
via MITRE·04:07 PM
Data Sourced
via MITRE·04:07 PM
Description
Data Sourced
via OSV·04:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·04:15 PM
DescriptionSeverityWeaknessAffected Software
Jan 8, 2025
News Published
via ZDNet·04:06 PM

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-2025-0247?

CVE-2025-0247 is classified as a high-severity vulnerability due to the potential for memory corruption and arbitrary code execution.

2

How do I fix CVE-2025-0247?

To mitigate CVE-2025-0247, update Firefox and Thunderbird to version 134 or higher.

3

Which versions of Firefox are affected by CVE-2025-0247?

CVE-2025-0247 affects Firefox versions prior to 134.

4

Which versions of Thunderbird are affected by CVE-2025-0247?

CVE-2025-0247 affects Thunderbird versions prior to 134.

5

What types of products are impacted by CVE-2025-0247?

CVE-2025-0247 impacts both Firefox and Thunderbird applications.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203