What’s Vulnerable › Vulnerabilities

CVE-2021-47667

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 36.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-05 · updated 2026-06-17
• Weakness: CWE-78

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.

Affected products

• ZendTo: from 5.24-3 before 6.10-7 — fixed in 6.10-7

How to fix

Upgrade to a fixed version: ZendTo 6.10-7. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2021-47667 or the next vulnerability affects your stack