Mozilla Security Updates (20th April 2021)

Ref# ADV2021_54 | Date: Apr 20th 2021

Mozilla published security updates on 20th April 2021, addressing vulnerabilities in the following products. It is recommended that you take the necessary precautions by ensuring your products are always updated.

Affected versions:

  • Firefox versions 88
  • Firefox ESR version 78.10    
  • Thunderbird version 78.9

For more information on these Mozilla updates, you can follow the URL:

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

PDF Download: Mozilla Security Updates.pdf


  •  Mozilla Security Advisories (20th April 2021) Retrieved from US-CERT


  • Mozilla Security Advisory (20th April 2021) Retrieved from Canadian Centre for Cyber Security (Cyber Centre)