Critical severity · published Jun 11, 2018
CVE-2017-7821
A vulnerability where WebExtensions can download and attempt to open a file of some non-executable file types
9.8
CVSS
1.9%
EPSS
No
On KEV
Description
A vulnerability where WebExtensions can download and attempt to open a file of some non-executable file types. This can be triggered without specific user interaction for the file download and open actions. This could be used to trigger known vulnerabilities in the programs that handle those document types. This vulnerability affects Firefox < 56.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.9% · higher than 80% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
through 55.0.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-7821
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-7821
Third Party Advisory
http://www.securityfocus.com/bid/101057
Third Party Advisory
http://www.securitytracker.com/id/1039465
Exploit
https://bugzilla.mozilla.org/show_bug.cgi?id=1346515
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-21/
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