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.
Conclusion & alert: CVE-2014-0016 is rated Low Risk (34.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.31%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-03-30 | 0.74% | 0.31% | -0.43% |
| 2 | 2025-03-29 | 0.34% | 0.74% | +0.40% |
| 3 | 2023-03-07 | — | 0.34% | — |
Full EPSS history (4 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2014-0016 unimportant priority: Debian including 1 source packages (stunnel4), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. | https://security-tracker.debian.org/tracker/CVE-2014-0016 |
gentoo
|
normal | CVE-2014-0016: 1 GLSA(s) (201408-14), 1 atom(s) (net-misc/stunnel); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2014-0016 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2014-0016 |
suse
|
medium | CVE-2014-0016 severity moderate: SUSE including 10 source package names (stunnel, stunnel-5.00-1.19, …), 47 product×package rows across 42 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (42 product lines)): Known Not Affected 31, Fixed 16. | https://www.suse.com/security/cve/CVE-2014-0016/ |
ubuntu
|
medium | CVE-2014-0016 medium priority: Ubuntu including 1 source packages (stunnel4), 14 status rows across 14 suites (artful, bionic, lucid, precise, quantal, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): released 9, ignored 4, not-affected 1. | https://ubuntu.com/security/CVE-2014-0016 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| stunnel | stunnel | <= 4.56 | cpe:2.3:a:stunnel:stunnel:*:*:*:*:*:*:*:* |
| stunnel | stunnel | 0.1 | cpe:2.3:a:stunnel:stunnel:0.1:*:*:*:*:*:*:* |
| stunnel | stunnel | 1.0 | cpe:2.3:a:stunnel:stunnel:1.0:*:*:*:*:*:*:* |
| stunnel | stunnel | 1.1 | cpe:2.3:a:stunnel:stunnel:1.1:*:*:*:*:*:*:* |
| stunnel | stunnel | 1.2 | cpe:2.3:a:stunnel:stunnel:1.2:*:*:*:*:*:*:* |
| stunnel | stunnel | 1.3 | cpe:2.3:a:stunnel:stunnel:1.3:*:*:*:*:*:*:* |
| stunnel | stunnel | 1.4 | cpe:2.3:a:stunnel:stunnel:1.4:*:*:*:*:*:*:* |
| stunnel | stunnel | 1.5 | cpe:2.3:a:stunnel:stunnel:1.5:*:*:*:*:*:*:* |
| stunnel | stunnel | 1.6 | cpe:2.3:a:stunnel:stunnel:1.6:*:*:*:*:*:*:* |
| stunnel | stunnel | 2.0 | cpe:2.3:a:stunnel:stunnel:2.0:*:*:*:*:*:*:* |
| stunnel | stunnel | 2.1 | cpe:2.3:a:stunnel:stunnel:2.1:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:b1:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:b2:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:b3:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:b4:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:b5:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:b6:*:*:*:*:*:* |
| stunnel | stunnel | 3.0 | cpe:2.3:a:stunnel:stunnel:3.0:b7:*:*:*:*:*:* |
| stunnel | stunnel | 3.1 | cpe:2.3:a:stunnel:stunnel:3.1:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.2 | cpe:2.3:a:stunnel:stunnel:3.2:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.3 | cpe:2.3:a:stunnel:stunnel:3.3:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.4a | cpe:2.3:a:stunnel:stunnel:3.4a:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.5 | cpe:2.3:a:stunnel:stunnel:3.5:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.6 | cpe:2.3:a:stunnel:stunnel:3.6:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.7 | cpe:2.3:a:stunnel:stunnel:3.7:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.8 | cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.8 | cpe:2.3:a:stunnel:stunnel:3.8:p1:*:*:*:*:*:* |
| stunnel | stunnel | 3.8 | cpe:2.3:a:stunnel:stunnel:3.8:p2:*:*:*:*:*:* |
| stunnel | stunnel | 3.8 | cpe:2.3:a:stunnel:stunnel:3.8:p3:*:*:*:*:*:* |
| stunnel | stunnel | 3.8 | cpe:2.3:a:stunnel:stunnel:3.8:p4:*:*:*:*:*:* |
| stunnel | stunnel | 3.8p1 | cpe:2.3:a:stunnel:stunnel:3.8p1:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.8p2 | cpe:2.3:a:stunnel:stunnel:3.8p2:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.8p3 | cpe:2.3:a:stunnel:stunnel:3.8p3:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.8p4 | cpe:2.3:a:stunnel:stunnel:3.8p4:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.9 | cpe:2.3:a:stunnel:stunnel:3.9:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.10 | cpe:2.3:a:stunnel:stunnel:3.10:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.11 | cpe:2.3:a:stunnel:stunnel:3.11:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.12 | cpe:2.3:a:stunnel:stunnel:3.12:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.13 | cpe:2.3:a:stunnel:stunnel:3.13:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.14 | cpe:2.3:a:stunnel:stunnel:3.14:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.15 | cpe:2.3:a:stunnel:stunnel:3.15:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.16 | cpe:2.3:a:stunnel:stunnel:3.16:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.17 | cpe:2.3:a:stunnel:stunnel:3.17:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.18 | cpe:2.3:a:stunnel:stunnel:3.18:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.19 | cpe:2.3:a:stunnel:stunnel:3.19:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.20 | cpe:2.3:a:stunnel:stunnel:3.20:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.21 | cpe:2.3:a:stunnel:stunnel:3.21:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.21a | cpe:2.3:a:stunnel:stunnel:3.21a:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.21b | cpe:2.3:a:stunnel:stunnel:3.21b:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.21c | cpe:2.3:a:stunnel:stunnel:3.21c:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.22 | cpe:2.3:a:stunnel:stunnel:3.22:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.23 | cpe:2.3:a:stunnel:stunnel:3.23:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.24 | cpe:2.3:a:stunnel:stunnel:3.24:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.25 | cpe:2.3:a:stunnel:stunnel:3.25:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.26 | cpe:2.3:a:stunnel:stunnel:3.26:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.00 | cpe:2.3:a:stunnel:stunnel:4.00:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.0 | cpe:2.3:a:stunnel:stunnel:4.0:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.01 | cpe:2.3:a:stunnel:stunnel:4.01:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.02 | cpe:2.3:a:stunnel:stunnel:4.02:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.03 | cpe:2.3:a:stunnel:stunnel:4.03:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.04 | cpe:2.3:a:stunnel:stunnel:4.04:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.05 | cpe:2.3:a:stunnel:stunnel:4.05:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.06 | cpe:2.3:a:stunnel:stunnel:4.06:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.07 | cpe:2.3:a:stunnel:stunnel:4.07:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.08 | cpe:2.3:a:stunnel:stunnel:4.08:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.09 | cpe:2.3:a:stunnel:stunnel:4.09:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.10 | cpe:2.3:a:stunnel:stunnel:4.10:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.11 | cpe:2.3:a:stunnel:stunnel:4.11:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.12 | cpe:2.3:a:stunnel:stunnel:4.12:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.13 | cpe:2.3:a:stunnel:stunnel:4.13:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.14 | cpe:2.3:a:stunnel:stunnel:4.14:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.15 | cpe:2.3:a:stunnel:stunnel:4.15:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.16 | cpe:2.3:a:stunnel:stunnel:4.16:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.17 | cpe:2.3:a:stunnel:stunnel:4.17:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.18 | cpe:2.3:a:stunnel:stunnel:4.18:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.19 | cpe:2.3:a:stunnel:stunnel:4.19:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.20 | cpe:2.3:a:stunnel:stunnel:4.20:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.21 | cpe:2.3:a:stunnel:stunnel:4.21:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.22 | cpe:2.3:a:stunnel:stunnel:4.22:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| http://www.openwall.com/lists/oss-security/2014/03/05/1 | Mailing List Third Party Advisory |
| http://www.securityfocus.com/bid/65964 | Third Party Advisory VDB Entry |
| https://bugzilla.redhat.com/attachment.cgi?id=870826&action=diff | Patch |
| https://bugzilla.redhat.com/show_bug.cgi?id=1072180 | Issue Tracking Third Party Advisory VDB Entry |
| https://www.stunnel.org/sdf_ChangeLog.html | Release Notes Vendor Advisory |