High severity · published Jan 8, 2020
CVE-2019-11759
An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack
8.8
CVSS
1.6%
EPSS
No
On KEV
Description
An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a 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)1.6% · higher than 76% 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-2019-11759
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-11759
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1577953
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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