CVSS 3.1
4.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NCVE-2021-38509
Medium (4.3). EPSS 1.8% chance of exploitation in the next 30 days.
Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Severity
- EPSS
- 1.8% chance of exploitation in the next 30 days; higher than 77% of CVEs (scores of 2026-10-31)
- CWE
- CWE-1021
- Published
- Modified
- Record from
- the NVD, synced
Affected
- debian:debian_linux
- mozilla:firefox
- mozilla:firefox_esr
- mozilla:thunderbird