High severity · published Mar 25, 2020
CVE-2020-6806
By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution
8.8
CVSS
2.6%
EPSS
No
On KEV
Description
By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.
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)2.6% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 74.0 · source: NVD
FE
Firefox Esr · Mozilla
before 68.6.0 · source: NVD
TH
Thunderbird · Mozilla
before 68.6.0 · source: NVD
UL
Ubuntu Linux · Canonical
16.04; 18.04; 19.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-6806
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-6806
Third Party Advisory
http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.html
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1612308
Third Party Advisory
https://usn.ubuntu.com/4328-1/
Third Party Advisory
https://usn.ubuntu.com/4335-1/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-08/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-09/
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