CVE-2021-23979: High severity Mozilla Firefox vulnerability
Mozilla developers reported memory safety bugs present in Firefox 85. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 86.
Other sources
Mozilla developers Tyson Smith, Lars T Hansen, Valentin Gosu, and Sebastian Hengst reported memory safety bugs present in Firefox 85. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 86 - Upgrade
Upgrade
alpine/firefoxto a version that resolves this vulnerability.Fixed in 87.0-r0 - Upgrade
Upgrade
alpine/librewolfto a version that resolves this vulnerability.Fixed in 87.0-r0
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the CVE ID of this vulnerability?
The CVE ID of this vulnerability is CVE-2021-23979.
Who reported this vulnerability?
Mozilla developers Tyson Smith, Lars T Hansen, Valentin Gosu, and Sebastian Hengst reported this vulnerability.
What is the severity of CVE-2021-23979?
The severity of CVE-2021-23979 is high with a severity value of 7.
What software is affected by CVE-2021-23979?
Mozilla Firefox version up to exclusive 86 is affected by CVE-2021-23979.
How can CVE-2021-23979 be exploited?
With enough effort, this vulnerability could have been exploited to run arbitrary code.