Unspecified vulnerability in stunnel before 4.23, when running as a service on Windows…
Priority LOW 32CWE-264Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Complete · Complete · Complete
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-264.
Summary
Unspecified vulnerability in stunnel before 4.23, when running as a service on Windows, allows local users to gain privileges via unknown attack vectors.
Why it matters now
EPSS 0.00346 28th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 71
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:stunnel:stunnel:0.1:*:*:*:*:*:*:* | 0.1 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:1.0:*:*:*:*:*:*:* | 1.0 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:1.1:*:*:*:*:*:*:* | 1.1 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:1.2:*:*:*:*:*:*:* | 1.2 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:1.3:*:*:*:*:*:*:* | 1.3 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:1.4:*:*:*:*:*:*:* | 1.4 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:1.5:*:*:*:*:*:*:* | 1.5 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:1.6:*:*:*:*:*:*:* | 1.6 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:2.0:*:*:*:*:*:*:* | 2.0 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:2.1:*:*:*:*:*:*:* | 2.1 | Vulnerable | Stunnel |
- cpe:2.3:a:stunnel:stunnel:0.1:*:*:*:*:*:*:* Versions 0.1 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:1.1:*:*:*:*:*:*:* Versions 1.1 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:1.2:*:*:*:*:*:*:* Versions 1.2 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:1.3:*:*:*:*:*:*:* Versions 1.3 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:1.4:*:*:*:*:*:*:* Versions 1.4 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:1.5:*:*:*:*:*:*:* Versions 1.5 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:1.6:*:*:*:*:*:*:* Versions 1.6 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:2.1:*:*:*:*:*:*:* Versions 2.1 Vulnerable ·Stunnel
Show 61 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:stunnel:stunnel:3.0:*:*:*:*:*:*:* | 3.0 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.0:b1:*:*:*:*:*:* | 3.0 b1 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.0:b2:*:*:*:*:*:* | 3.0 b2 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.0:b3:*:*:*:*:*:* | 3.0 b3 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.0:b4:*:*:*:*:*:* | 3.0 b4 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.0:b5:*:*:*:*:*:* | 3.0 b5 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.0:b6:*:*:*:*:*:* | 3.0 b6 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.0:b7:*:*:*:*:*:* | 3.0 b7 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.1:*:*:*:*:*:*:* | 3.1 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.2:*:*:*:*:*:*:* | 3.2 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.3:*:*:*:*:*:*:* | 3.3 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.4a:*:*:*:*:*:*:* | 3.4a | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.5:*:*:*:*:*:*:* | 3.5 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.6:*:*:*:*:*:*:* | 3.6 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.7:*:*:*:*:*:*:* | 3.7 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:* | 3.8 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.8:p1:*:*:*:*:*:* | 3.8 p1 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.8:p2:*:*:*:*:*:* | 3.8 p2 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.8:p3:*:*:*:*:*:* | 3.8 p3 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.8:p4:*:*:*:*:*:* | 3.8 p4 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.9:*:*:*:*:*:*:* | 3.9 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.10:*:*:*:*:*:*:* | 3.10 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.11:*:*:*:*:*:*:* | 3.11 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.12:*:*:*:*:*:*:* | 3.12 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.13:*:*:*:*:*:*:* | 3.13 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.14:*:*:*:*:*:*:* | 3.14 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.15:*:*:*:*:*:*:* | 3.15 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.16:*:*:*:*:*:*:* | 3.16 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.17:*:*:*:*:*:*:* | 3.17 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.18:*:*:*:*:*:*:* | 3.18 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.19:*:*:*:*:*:*:* | 3.19 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.20:*:*:*:*:*:*:* | 3.20 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.21:*:*:*:*:*:*:* | 3.21 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.21a:*:*:*:*:*:*:* | 3.21a | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.21b:*:*:*:*:*:*:* | 3.21b | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.21c:*:*:*:*:*:*:* | 3.21c | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.22:*:*:*:*:*:*:* | 3.22 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.24:*:*:*:*:*:*:* | 3.24 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.0:*:*:*:*:*:*:* | 4.0 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.01:*:*:*:*:*:*:* | 4.01 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.02:*:*:*:*:*:*:* | 4.02 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.03:*:*:*:*:*:*:* | 4.03 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.04:*:*:*:*:*:*:* | 4.04 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.05:*:*:*:*:*:*:* | 4.05 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.06:*:*:*:*:*:*:* | 4.06 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.07:*:*:*:*:*:*:* | 4.07 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.08:*:*:*:*:*:*:* | 4.08 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.09:*:*:*:*:*:*:* | 4.09 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.10:*:*:*:*:*:*:* | 4.10 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.11:*:*:*:*:*:*:* | 4.11 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.12:*:*:*:*:*:*:* | 4.12 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.13:*:*:*:*:*:*:* | 4.13 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.14:*:*:*:*:*:*:* | 4.14 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.15:*:*:*:*:*:*:* | 4.15 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.16:*:*:*:*:*:*:* | 4.16 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.17:*:*:*:*:*:*:* | 4.17 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.18:*:*:*:*:*:*:* | 4.18 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.19:*:*:*:*:*:*:* | 4.19 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.20:*:*:*:*:*:*:* | 4.20 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.21:*:*:*:*:*:*:* | 4.21 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:4.22:*:*:*:*:*:*:* | 4.22 | Vulnerable | Stunnel |
- cpe:2.3:a:stunnel:stunnel:3.0:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.0:b1:*:*:*:*:*:* Versions 3.0 b1 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.0:b2:*:*:*:*:*:* Versions 3.0 b2 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.0:b3:*:*:*:*:*:* Versions 3.0 b3 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.0:b4:*:*:*:*:*:* Versions 3.0 b4 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.0:b5:*:*:*:*:*:* Versions 3.0 b5 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.0:b6:*:*:*:*:*:* Versions 3.0 b6 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.0:b7:*:*:*:*:*:* Versions 3.0 b7 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.1:*:*:*:*:*:*:* Versions 3.1 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.2:*:*:*:*:*:*:* Versions 3.2 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.3:*:*:*:*:*:*:* Versions 3.3 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.4a:*:*:*:*:*:*:* Versions 3.4a Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.5:*:*:*:*:*:*:* Versions 3.5 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.6:*:*:*:*:*:*:* Versions 3.6 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.7:*:*:*:*:*:*:* Versions 3.7 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:* Versions 3.8 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.8:p1:*:*:*:*:*:* Versions 3.8 p1 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.8:p2:*:*:*:*:*:* Versions 3.8 p2 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.8:p3:*:*:*:*:*:* Versions 3.8 p3 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.8:p4:*:*:*:*:*:* Versions 3.8 p4 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.9:*:*:*:*:*:*:* Versions 3.9 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.10:*:*:*:*:*:*:* Versions 3.10 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.11:*:*:*:*:*:*:* Versions 3.11 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.12:*:*:*:*:*:*:* Versions 3.12 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.13:*:*:*:*:*:*:* Versions 3.13 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.14:*:*:*:*:*:*:* Versions 3.14 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.15:*:*:*:*:*:*:* Versions 3.15 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.16:*:*:*:*:*:*:* Versions 3.16 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.17:*:*:*:*:*:*:* Versions 3.17 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.18:*:*:*:*:*:*:* Versions 3.18 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.19:*:*:*:*:*:*:* Versions 3.19 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.20:*:*:*:*:*:*:* Versions 3.20 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.21:*:*:*:*:*:*:* Versions 3.21 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.21a:*:*:*:*:*:*:* Versions 3.21a Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.21b:*:*:*:*:*:*:* Versions 3.21b Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.21c:*:*:*:*:*:*:* Versions 3.21c Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.22:*:*:*:*:*:*:* Versions 3.22 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.24:*:*:*:*:*:*:* Versions 3.24 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.01:*:*:*:*:*:*:* Versions 4.01 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.02:*:*:*:*:*:*:* Versions 4.02 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.03:*:*:*:*:*:*:* Versions 4.03 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.04:*:*:*:*:*:*:* Versions 4.04 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.05:*:*:*:*:*:*:* Versions 4.05 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.06:*:*:*:*:*:*:* Versions 4.06 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.07:*:*:*:*:*:*:* Versions 4.07 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.08:*:*:*:*:*:*:* Versions 4.08 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.09:*:*:*:*:*:*:* Versions 4.09 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.10:*:*:*:*:*:*:* Versions 4.10 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.11:*:*:*:*:*:*:* Versions 4.11 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.12:*:*:*:*:*:*:* Versions 4.12 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.13:*:*:*:*:*:*:* Versions 4.13 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.14:*:*:*:*:*:*:* Versions 4.14 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.15:*:*:*:*:*:*:* Versions 4.15 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.16:*:*:*:*:*:*:* Versions 4.16 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.17:*:*:*:*:*:*:* Versions 4.17 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.18:*:*:*:*:*:*:* Versions 4.18 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.19:*:*:*:*:*:*:* Versions 4.19 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.20:*:*:*:*:*:*:* Versions 4.20 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.21:*:*:*:*:*:*:* Versions 4.21 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:4.22:*:*:*:*:*:*:* Versions 4.22 Vulnerable ·Stunnel
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2008-2400
- 2026-10-03 Alias added: GHSA-r8p5-h86h-72h9
References
More Stunnel vulnerabilities
- TI-2011-02592 stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a… CVSS 2.0HIGH 9.3
- TI-2001-00060 Format string vulnerability in stunnel 3.8 and earlier allows attackers to execute… CVSS 2.0HIGH 10.0
- TI-2002-00002 Format string vulnerability in stunnel before 3.22 when used in client mode for (1) smtp… CVSS 2.0HIGH 7.5
- TI-2021-03525 Improper certificate validation in stunnel CVSS 3.1HIGH 7.5
- TI-2013-01549 stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are… CVSS 2.0MEDIUM 6.6
- TI-2008-02320 The OCSP functionality in stunnel before 4.24 does not properly search certificate… CVSS 2.0MEDIUM 6.8
Sources
- CVE-2008-2400 · CVE Program
- CVE-2008-2400 · NVD
- FIRST EPSS
- GHSA-r8p5-h86h-72h9 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences