8.8
CWE
787
Advisory Published
CVE Published
Updated

CVE-2021-23965

First published: Tue Jan 26 2021(Updated: )

Mozilla developers reported memory safety bugs present in Firefox 84. 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 affects Firefox < 85.

Credit: security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Firefox<85
85
Firefox<85.0

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2021-23965?

    CVE-2021-23965 is classified as a critical vulnerability due to potential memory corruption leading to arbitrary code execution.

  • How do I fix CVE-2021-23965?

    To address CVE-2021-23965, update Firefox to version 85 or newer.

  • Which versions of Firefox are affected by CVE-2021-23965?

    CVE-2021-23965 affects all versions of Firefox prior to version 85.

  • Can CVE-2021-23965 be exploited remotely?

    Yes, CVE-2021-23965 has the potential to be exploited remotely if a user visits a malicious webpage.

  • What are the consequences of exploiting CVE-2021-23965?

    Exploiting CVE-2021-23965 could allow an attacker to execute arbitrary code on the affected system.

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.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203