PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in…
Priority LOW 32CWE-203Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-203.
Summary
PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).
Why it matters now
EPSS 0.03134 87th 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 · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:* | 0.68 – 0.73 | Vulnerable | PuTTY |
| cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | 31 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
- cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:* Versions 0.68 – 0.73 Vulnerable ·PuTTY
- cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-14002
- 2026-10-03 Alias added: GHSA-f25w-hjcw-x829
References
Advisory 6
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
- https://lists.tartarus.org/pipermail/putty-announce/
- https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/
- FEDORA-2020-35442ce9b7
- FEDORA-2020-f4dba093f1
- https://security.netapp.com/advisory/ntap-20200717-0003/
Sources
- CVE-2020-14002 · CVE Program
- CVE-2020-14002 · NVD
- FIRST EPSS
- GHSA-f25w-hjcw-x829 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-14002 · 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