High severity · published Dec 9, 2020
CVE-2020-26959
During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable…
8.8
CVSS
1.3%
EPSS
No
On KEV
Description
During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 70% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 83.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.5 · source: NVD
TH
Thunderbird · Mozilla
before 78.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26959
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-26959
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1669466
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-50/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-51/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-52/
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