High severity · published Apr 24, 2020
CVE-2020-6819
Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
In wildKEV
8.1
CVSS
3%
EPSS
Yes
On KEV
Description
Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
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)3.0% · higher than 87% of CVEs
Exploited in the wildYes
CISA KEVListed Nov 3, 2021
Federal remediation dueMay 3, 2022
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 74.0.1 · source: vendor, NVD
FE
Firefox ESR · Mozilla
before 68.6.1 · source: vendor
TH
Thunderbird · Mozilla
before 68.7.0 · source: vendor, NVD
FA
Firefox and Thunderbird · Mozilla
All versions, or not specified · source: KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-6819
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-6819
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_MISC
https://www.mozilla.org/security/advisories/mfsa2020-14/
x_refsource_MISC
https://www.mozilla.org/security/advisories/mfsa2020-11/
x_refsource_MISC
https://bugzilla.mozilla.org/show_bug.cgi?id=1620818
vendor-advisory
https://usn.ubuntu.com/4335-1/
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