CVE-2017-5421
CVSS v3
7.5
HIGH
EPSS Score
1.9 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
A malicious site could spoof the contents of the print preview window if popup windows are enabled, resulting in user confusion of what site is currently loaded. This vulnerability affects Firefox < 52 and Thunderbird < 52.
Technical details
- Published
- 2018-06-11
Frequently asked questions
What is CVE-2017-5421?
A malicious site could spoof the contents of the print preview window if popup windows are enabled, resulting in user confusion of what site is currently loaded. This vulnerability affects Firefox < 52 and Thunderbird < 52.
Is CVE-2017-5421 actively exploited?
Active exploitation of CVE-2017-5421 has not been confirmed. Its EPSS score was 1.9% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2017-5421?
CVE-2017-5421 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2017-5421 affecting your environment?
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