cve.bz

CVE-2021-23953

4.3 mediumEPSS 1.1%

Medium (4.3) in mozilla. EPSS 1.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS
1.1% chance of exploitation in the next 30 days; higher than 64% of CVEs (scores of 2026-10-31)
Published
Modified
Record from
the NVD, synced

Affected

References

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