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Vulnerability record · CVE-2021-47667 · published 5 April 2025

CVE-2021-47667: OS command injection vulnerability

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.

10.0 CVSS 3.1 Critical EPSS 37% · top 1.6% CWE-78 · OS command injection Deferred
10.0CVSS 3.1 base score
37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2021-47667), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.