High severity · published May 26, 2020
CVE-2020-12387
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability
8.1
CVSS
1.4%
EPSS
No
On KEV
Description
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 76.0 · source: NVD
FE
Firefox Esr · Mozilla
before 68.8.0 · source: NVD
TH
Thunderbird · Mozilla
before 68.8.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-12387
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-12387
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1545345
Third Party Advisory
https://security.gentoo.org/glsa/202005-03
Third Party Advisory
https://security.gentoo.org/glsa/202005-04
Broken Link
https://usn.ubuntu.com/4373-1/
Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-16/
Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-17/
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