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CVE-2017-7820

Date: June 11, 2018

The "instanceof" operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web content can provide its own result for that operator, possibly tricking the browser or extension into mishandling the element. This vulnerability affects Firefox < 56.

Severity Score

Related Resources (7)

https://people.canonical.com/~ubuntu-security/cve/CVE-2017-7820
https://bugzilla.mozilla.org/show_bug.cgi?id=1378207
https://www.mozilla.org/security/advisories/mfsa2017-21/
https://nvd.nist.gov/vuln/detail/CVE-2017-7820
http://www.securityfocus.com/bid/101057
http://www.securitytracker.com/id/1039465
https://www.mend.io/vulnerability-database/CVE-2017-7820

Severity Score

Weakness Type (CWE)

Insufficient Information

NVD-CWE-noinfo

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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