stunnel: Improper initialization of PRNG after fork()
Published Mar 23, 2014
4.3
MEDIUMCVSS 2.0
EPSS 2.15%
Description
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.
Affected products
No data.
- ≤ 4.56
- 0.1
- 1.0
- 1.1
- 1.2
- 1.3
- 1.4
- 1.5
- 1.6
- 2.0
- 2.1
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0
- 3.0
- 3.1
- 3.2
- 3.3
- 3.4a
- 3.5
- 3.6
- 3.7
- 3.8
- 3.8
- 3.8
- 3.8
- 3.8
- 3.8p1
- 3.8p2
- 3.8p3
- 3.8p4
- 3.9
- 3.10
- 3.11
- 3.12
- 3.13
- 3.14
- 3.15
- 3.16
- 3.17
- 3.18
- 3.19
- 3.20
- 3.21
- 3.21a
- 3.21b
- 3.21c
- 3.22
- 3.23
- 3.24
- 3.25
- 3.26
- 4.00
- 4.0
- 4.01
- 4.02
- 4.03
- 4.04
- 4.05
- 4.06
- 4.07
- 4.08
- 4.09
- 4.10
- 4.11
- 4.12
- 4.13
- 4.14
- 4.15
- 4.16
- 4.17
- 4.18
- 4.19
- 4.20
- 4.21
- 4.22
- 4.23
- 4.24
- 4.25
- 4.26
- 4.27
- 4.28
- 4.29
- 4.30
- 4.31
- 4.32
- 4.33
- 4.34
- 4.35
- 4.36
- 4.37
- 4.38
- 4.39
- 4.40
- 4.41
- 4.42
- 4.43
- 4.44
- 4.45
- 4.46
- 4.47
- 4.48
- 4.49
- 4.50
- 4.51
- 4.52
- 4.53
- 4.54
- 4.55
No data.
Red Hat Enterprise Linux 5
stunnel
Not affected
Red Hat Enterprise Linux 6
stunnel
Not affected
Red Hat Enterprise Linux 7
stunnel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | stunnel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | stunnel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | stunnel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue does not affect the version of stunnel package as shipped with Red Hat Enterprise Linux 5 and 6.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.15% (0.02155) | 81.50th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.15% (0.02155) | 79.73th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.31% (0.00312) | 52.20th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.34% (0.00337) | 72.17th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.34% (0.00337) | 70.52th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.34% (0.00337) | 66.72th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (8)
- http://www.openwall.com/lists/oss-security/2014/03/05/1 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/65964 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2014-0016 Vendor Advisory
- https://bugzilla.redhat.com/attachment.cgi?id=870826&action=diff x_refsource_MISCPatch
- https://bugzilla.redhat.com/show_bug.cgi?id=1072180 x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
- https://nvd.nist.gov/vuln/detail/CVE-2014-0016
- https://www.cve.org/CVERecord?id=CVE-2014-0016
- https://www.stunnel.org/sdf_ChangeLog.html x_refsource_CONFIRMRelease NotesVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2014/03/05/1 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/65964 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2014-0016 | Vendor Advisory | |
| https://bugzilla.redhat.com/attachment.cgi?id=870826&action=diff | x_refsource_MISCPatch | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1072180 | x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry | |
| https://nvd.nist.gov/vuln/detail/CVE-2014-0016 | ||
| https://www.cve.org/CVERecord?id=CVE-2014-0016 | ||
| https://www.stunnel.org/sdf_ChangeLog.html | x_refsource_CONFIRMRelease NotesVendor Advisory |
Change history (0)
No recorded changes yet.