CVE-2014-0016

What it is

stunnel before 5.00, when using fork threading, does not properly update the state of the OpenSSL pseudo-random number generator (PRNG), which causes subsequent children with the same process ID to use the same entropy pool and allows remote attackers to obtain private keys for EC (ECDSA) or DSA certificates.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

2.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2014-03-24 16:31 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:02 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.2% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2014-03-24 16:31 UTC

Last modified

2026-06-17 00:02 UTC

Exploit probability

2.2% · EPSS, next 30 days

Weakness

CWE-332

Record status

Modified

Affected

• Stunnel ≤ 4.56
• Stunnel 0.1
• Stunnel 1.0
• Stunnel 1.1
• Stunnel 1.2
• Stunnel 1.3
• Stunnel 1.4
• Stunnel 1.5

Attack profile CVSS 2.0 · 4.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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