CVE-2021-47667: zend zendto OS Command Injection
CVSS: 10.0v3.1CriticalDeferred
Published 05-04-2025Last modified 07-04-2025
Vulnerability summary
CVE-2021-47667 is a critical (CVSS 10.0) OS Command Injection vulnerability in zend zendto. EPSS estimates a 36.61% chance of exploitation in the next 30 days, higher than 98.4% of scored vulnerabilities.
CVSS score
10.0/10
010
Critical · v3.1 (CVE.org)EPSS score
36.61%
0%100%
High · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 05-04-2025PublishedVulnerability first disclosed.
- 07-04-2025Last modifiedVulnerability information updated.
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 metrics
2 scores · 2 sources · 1 versionCritical 10.0Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST10.0CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
36.61%
Chance of exploitation in the next 30 days
Percentile
98%
Versus all other CVEs
30-day change
0.00 pp
From 36.61% on 21-09-2026
21-09-202621-10-2026
EPSS score36.61%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Zend1 product
- zendto≥ 5.24-3, < 6.10-7
1 vendor · 1 product