Ref# ADV2025_165 | Date: Jun 27th 2025

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Mozilla has published a security advisory highlighting vulnerabilities in the following products on June 24th, 2025. It is recommended that you take the necessary precautions by ensuring your products are always updated. 

• Firefox ESR – versions prior to 128.12 

• Firefox ESR – versions prior to 115.25 

• Firefox – versions prior to 140 

For more information on these updates, you can follow these URLs: 

• Mozilla Foundation Security Advisory MFSA 2025-53 

• Mozilla Foundation Security Advisory MFSA 2025-52 

• Mozilla Foundation Security Advisory MFSA 2025-51 

• Mozilla Security Advisories 

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

PDF Download: Mozilla Security Advisory

References 

• Mozilla Security Advisories.  (June 24th, 2025). Retrieved from Mozilla. https://www.mozilla.org/en-US/security/advisories/  

• Mozilla Security Advisory. (June 24th, 2025). Retrieved from Canadian Centre for Cyber Security.Mozilla security advisory (AV25-367) – Canadian Centre for Cyber Security