What is CVE-2016-10034?

CVE-2016-10034 is a critical-severity vulnerability in Zend Framework, classified under Command Injection. CVSS score: 9.8/10. Published 2016-12-30.

How severe is CVE-2016-10034?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2016-10034 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Zend Framework

CVE-2016-10034

The setFrom function in the Sendmail adapter in the zend-mail component before 2.4.11, 2.5.x, 2.6.x, and 2.7.x before 2.7.2, and Zend Framework before 2.4.11 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" (backslash double quote) in a crafted e-mail address.

Vulnerability class: Command Injection (OS Command Injection)

Published 2016-12-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.384 (98.5th percentile), scored 2026-09-27.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.384 · newest: 0.384 · change: 0.000

Affected products

Zend Framework
Zend Zend-Mail — versions 2.5.0, 2.5.1, 2.5.2

Weakness classification (CWE)

CWE-77 — Command Injection

Public proof-of-concept exploits

References

security.gentoo.org/glsa/201804-10 (vendor-advisory)
www.exploit-db.com/exploits/42221/ (exploit)
framework.zend.com/security/advisory/ZF2016-04 (Vendor Advisory, Technical Description, Exploit)
legalhackers.com/advisories/ZendFramework-Exploit-ZendMail-Remote-Code-Exec-CVE… (Technical Description, Exploit, Third Party Advisory)
www.exploit-db.com/exploits/40979/ (exploit)
www.securitytracker.com/id/1037539 (vdb-entry)
www.exploit-db.com/exploits/40986/ (exploit)
www.securityfocus.com/bid/95144 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2016-10034?: CVE-2016-10034 is a critical-severity vulnerability in Zend Framework, classified under Command Injection. CVSS score: 9.8/10. Published 2016-12-30.
How severe is CVE-2016-10034?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2016-10034 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.