CVE-2017-7820 — Vulnetix

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CVE-2017-7820 PUBLISHED

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.

EPSS 0.81% · 74.1th percentile

Risk Scores

EPSS Score

0.81%

74.1th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:18.04:LTS	firefox	0
Ubuntu:16.04:LTS	firefox	41.0.2+build2-0ubuntu1, 42.0+build2-0ubuntu1, 44.0+build3-0ubuntu2
Ubuntu:14.04:LTS	firefox	41.0.2+build2-0ubuntu0.14.04.1, 42.0+build2-0ubuntu0.14.04.1, 43.0+build1-0ubuntu0.14.04.1

Timeline

Oct 2, 2017 CVE Published
Apr 14, 2021 EPSS Score
Jun 22, 2021 EPSS Score
Aug 23, 2021 EPSS Score
Oct 24, 2021 EPSS Score
Dec 25, 2021 EPSS Score
Feb 25, 2022 EPSS Score
Apr 28, 2022 EPSS Score
Jun 29, 2022 EPSS Score
Aug 31, 2022 EPSS Score
Nov 1, 2022 EPSS Score
Jan 2, 2023 EPSS Score

References

https://ubuntu.com/security/CVE-2017-7820 third-party-advisory
https://www.mozilla.org/en-US/security/advisories/mfsa2017-21/ third-party-advisory
https://ubuntu.com/security/notices/USN-3435-1 vendor-advisory
https://www.cve.org/CVERecord?id=CVE-2017-7820 third-party-advisory

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