CVE-2021-23970

Description

Context-specific code was included in a shared jump table; resulting in assertions being triggered in multithreaded wasm code. This vulnerability affects Firefox < 86.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.49%
Vendor Advisory gentoo.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
https://www.mozilla.org/security/advisories/mfsa2021-07/ release notes vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1681724 issue tracking permissions required vendor advisory
https://security.gentoo.org/glsa/202104-10 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-23970?
CVE-2021-23970 has been scored as a medium severity vulnerability.
How to fix CVE-2021-23970?
To fix CVE-2021-23970, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-23970 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-23970 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-23970?
CVE-2021-23970 affects Mozilla Firefox.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.