High severity · published Jan 8, 2020
CVE-2019-11757
When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it
8.8
CVSS
1.3%
EPSS
No
On KEV
Description
When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
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 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 70.0 · source: NVD
FE
Firefox Esr · Mozilla
before 68.2 · source: NVD
TH
Thunderbird · Mozilla
before 68.2 · source: NVD
UL
Ubuntu Linux · Canonical
16.04 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-11757
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-11757
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1577107
Third Party Advisory
https://security.gentoo.org/glsa/202003-10
Third Party Advisory
https://usn.ubuntu.com/4335-1/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-33/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-34/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-35/
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