CVE-2021-47667

10.0 criticalEPSS 37%

Critical (10.0). EPSS 37% chance of exploitation in the next 30 days.

An OS command injection vulnerability in lib/NSSDropoff.php in ZendTo 5.24-3 through 6.x before 6.10-7 allows unauthenticated remote attackers to execute arbitrary commands via shell metacharacters in the tmp_name parameter when dropping off a file via a POST /dropoff request.

Severity

CVSS 3.1

10.0 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS: 37% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
CWE: CWE-78
Published: 2025-04-05
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://projectblack.io/blog/zendto-nday-vulnerabilities/
https://projectblack.io/blog/zendto-nday-vulnerabilities/

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