CVE-2019-9806
CVSS v3
7.5
HIGH
EPSS Score
1.1 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
A vulnerability exists during authorization prompting for FTP transaction where successive modal prompts are displayed and cannot be immediately dismissed. This allows for a denial of service (DOS) attack. This vulnerability affects Firefox < 66.
Technical details
- Published
- 2019-04-26
Frequently asked questions
What is CVE-2019-9806?
A vulnerability exists during authorization prompting for FTP transaction where successive modal prompts are displayed and cannot be immediately dismissed. This allows for a denial of service (DOS) attack. This vulnerability affects Firefox < 66.
Is CVE-2019-9806 actively exploited?
Active exploitation of CVE-2019-9806 has not been confirmed. Its EPSS score was 1.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2019-9806?
CVE-2019-9806 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2019-9806 affecting your environment?
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