Format string vulnerability in stunnel before 3.22 when used in client mode for (1) smtp…
Priority MEDIUM 41Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
Format string vulnerability in stunnel before 3.22 when used in client mode for (1) smtp, (2) pop, or (3) nntp allows remote malicious servers to execute arbitrary code.
Why it matters now
EPSS 0.05283 92nd percentileScored 2026-11-07
Fix Fixed 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 · 25
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| 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:3.7:*:*:*:*:*:*:* | 3.7 | Vulnerable | Stunnel |
| cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:* | 3.8 | 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:3.3:*:*:*:*:*:*:* Versions 3.3 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.4a:*:*:*:*:*:*:* Versions 3.4a Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.7:*:*:*:*:*:*:* Versions 3.7 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:* Versions 3.8 Vulnerable ·Stunnel
- cpe:2.3:a:stunnel:stunnel:3.9:*:*:*:*:*:*:* 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
Show 15 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| 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:o:engardelinux:secure_linux:1.0.1:*:*:*:*:*:*:* | 1.0.1 | Vulnerable | Engardelinux |
| cpe:2.3:o:mandrakesoft:mandrake_linux:8.1:*:*:*:*:*:*:* | 8.1 | Vulnerable | Mandrakesoft |
| cpe:2.3:o:redhat:linux:7.2:*:*:*:*:*:*:* | 7.2 | Vulnerable | Red Hat |
- 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:o:engardelinux:secure_linux:1.0.1:*:*:*:*:*:*:* Versions 1.0.1 Vulnerable ·Engardelinux
- cpe:2.3:o:mandrakesoft:mandrake_linux:8.1:*:*:*:*:*:*:* Versions 8.1 Vulnerable ·Mandrakesoft
- cpe:2.3:o:redhat:linux:7.2:*:*:*:*:*:*:* Versions 7.2 Vulnerable ·Red Hat
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2002-0002
- 2026-10-03 Alias added: GHSA-8qj7-vx74-c666
References
Sources
- CVE-2002-0002 · CVE Program
- CVE-2002-0002 · NVD
- FIRST EPSS
- GHSA-8qj7-vx74-c666 · GitHub Advisory Database · CC BY 4.0
- CVE-2002-0002 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences