What is the severity of CVE-2021-23985?

CVE-2021-23985 has been classified as a high-severity vulnerability due to its potential for enabling remote code execution.

How do I fix CVE-2021-23985?

To fix CVE-2021-23985, update your Mozilla Firefox browser to version 87.0 or later.

Can CVE-2021-23985 be exploited remotely?

Yes, CVE-2021-23985 can be exploited remotely if the attacker can manipulate specific about:config settings.

What versions of Firefox are affected by CVE-2021-23985?

CVE-2021-23985 affects all versions of Mozilla Firefox prior to 87.0.

Is my system at risk if I'm using an older version of Firefox?

Yes, if you are using a version of Firefox older than 87.0, your system is at risk from CVE-2021-23985.

Vulnerability/
CVE-2021-23985

medium

6.5

23/3/2021

31/3/2021

3/8/2024

CVE-2021-23985

First published: Tue Mar 23 2021(Updated: )

If an attacker is able to alter specific about:config values (for example malware running on the user's computer), the Devtools remote debugging feature could have been enabled in a way that was unnoticable to the user. This would have allowed a remote attacker (able to make a direct network connection to the victim) to monitor the user's browsing activity and (plaintext) network traffic. This was addressed by providing a visual cue when Devtools has an open network socket.

Credit: security@mozilla.org

Affected Software	Affected Version	How to fix
Firefox	<87	87
Firefox	<87.0

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

MFSA2021-10

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

What is the severity of CVE-2021-23985?
CVE-2021-23985 has been classified as a high-severity vulnerability due to its potential for enabling remote code execution.
How do I fix CVE-2021-23985?
To fix CVE-2021-23985, update your Mozilla Firefox browser to version 87.0 or later.
Can CVE-2021-23985 be exploited remotely?
Yes, CVE-2021-23985 can be exploited remotely if the attacker can manipulate specific about:config settings.
What versions of Firefox are affected by CVE-2021-23985?
CVE-2021-23985 affects all versions of Mozilla Firefox prior to 87.0.
Is my system at risk if I'm using an older version of Firefox?
Yes, if you are using a version of Firefox older than 87.0, your system is at risk from CVE-2021-23985.

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