Ref# ADV2025_381 | Date: Oct 16th 2025

---

Mozilla published security advisories to address vulnerabilities in the following products on October 14, 2025. It is recommended that you take these necessary precautions by ensuring your products are always updated.

• Firefox – versions prior to 144
• Firefox ESR – versions prior to 115.29
• Firefox ESR – versions prior to 140.4
• Thunderbird – versions prior to 144
• Thunderbird – versions prior to 140.4

For more information on this update, you can follow this URL:

• Mozilla Security Advisories

The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary.

PDF Download: Mozilla Security Advisory

References

• Mozilla Foundation Security Advisories. (n.d.). Mozilla. https://www.mozilla.org/en-US/security/advisories/
• Mozilla Security Advisory. (October 16^th, 2025). Retrieved from Canadian Centre for Cyber Security. https://www.cyber.gc.ca/en/alerts-advisories/mozilla-security-advisory-av25-674