Thursday, April 18, 2024

Emergency Patch – 2 New Mozilla Firefox 0-Day Bugs Under Active Attack

Mozilla has recently released new versions of Firefox to fix two new critical zero-day vulnerabilities that are actively exploited by the threat actors.

The two critical zero-day vulnerabilities detected are Use-after-free bugs that cause certain computer programs to run in a way they weren’t programmed because they are writing toward areas in memory that have been previously cleared or used for other purposes.

On successful exploitation of these bugs, an attacker can crash programs and execute arbitrary commands on the affected device without any permission.

Patched versions of Mozilla Firefox

Here below we have listed all the newly-patched versions of Mozilla Firefox:-

  • Firefox 97.0.2
  • Firefox ESR 91.6.1
  • Firefox for Android 97.3.0
  • Focus 97.3.0

Zero-day Vulnerabilities

In the Security Advisory 2022-09, Mozilla Foundation has fixed two critical zero-day vulnerabilities, and they are:-

  • CVE ID: CVE-2022-26485
  • Flaw summary: Use-after-free in XSLT parameter processing
  • Severity: Critical
  • Description: Removing an XSLT parameter during processing could have led to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw.
  • Reporter: Wang Gang, Liu Jialei, Du Sihang, Huang Yi & Yang Kang of 360 ATA.
  • CVE ID: CVE-2022-26486
  • Flaw summary: Use-after-free in WebGPU IPC Framework
  • Severity: Critical
  • Description: An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape. We have had reports of attacks in the wild abusing this flaw.
  • Reporter: Wang Gang, Liu Jialei, Du Sihang, Huang Yi & Yang Kang of 360 ATA.

However, the developers of Firefox are aware of the reports of attacks in the wild, as these two vulnerabilities were actively exploited by the attackers. But, till now, Mozilla hasn’t shared any core details about the exploitation of these bugs.


The developers of Firefox have strongly recommended users to immediately update their existing vulnerable version of Firefox to the latest one to mitigate these two critical bugs.

Moreover, users can also manually check for the new updates, and to do so, they have to follow a few simple steps that we have mentioned below:-

  • First of all, you have to go to the Firefox menu.
  • Then you have to select the Help option.
  • After the above step, now you have to select the About Firefox option.
  • That’s it.

After executing the steps as mentioned above, Firefox will now automatically check the available latest update and install it.

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Guru baran
Guru baran
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.


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