The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have…
Priority MEDIUM 62CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent protocol message and leveraging the ability to connect to the Unix-domain socket representing the forwarded agent connection, which trigger a buffer overflow.
Why it matters now
EPSS 0.21816 97th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
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 · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:* | up to 0.67 | Vulnerable | PuTTY |
| cpe:2.3:o:opensuse:leap:42.2:*:*:*:*:*:*:* | 42.2 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse_project:leap:42.1:*:*:*:*:*:*:* | 42.1 | Vulnerable | Opensuse Project |
- cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:* Versions up to 0.67 Vulnerable ·PuTTY
- cpe:2.3:o:opensuse:leap:42.2:*:*:*:*:*:*:* Versions 42.2 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse_project:leap:42.1:*:*:*:*:*:*:* Versions 42.1 Vulnerable ·Opensuse Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2017-6542
- 2026-10-03 Alias added: GHSA-6q3h-v425-7xx2
References
Sources
- CVE-2017-6542 · CVE Program
- CVE-2017-6542 · NVD
- FIRST EPSS
- GHSA-6q3h-v425-7xx2 · GitHub Advisory Database · CC BY 4.0
- CVE-2017-6542 · 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