CVE-2021-23953
4.3
MEDIUM
CVSS 3.1
EPSS 0.30%
Description
If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
How to fix CVE-2021-23953
To remediate CVE-2021-23953, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 78.7.0esr-1 or later
- —upgrade to 1:78.7.0-1 or later
Is CVE-2021-23953 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.7.0esr-1
- from 0, < 1:78.7.0-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |