What’s Vulnerable › Vulnerabilities

CVE-2020-14002

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-29 · updated 2026-06-17
• Weakness: CWE-203

Description

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).

Affected products

• Fedoraproject Fedora: 31, 32
• NetApp Oncommand Unified Manager Core Package: all versions
• PuTTY: from 0.68 through 0.73

References

• https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26TACCSQYYCPWAJYNAUIXJGZ5RGORJZV/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JPV4A77EDCT4BTFO5BE26ZH72BG4E5IJ/
• https://lists.tartarus.org/pipermail/putty-announce/
• https://security.netapp.com/advisory/ntap-20200717-0003/
• https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
• https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/
• https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26TACCSQYYCPWAJYNAUIXJGZ5RGORJZV/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JPV4A77EDCT4BTFO5BE26ZH72BG4E5IJ/
• https://lists.tartarus.org/pipermail/putty-announce/
• https://security.netapp.com/advisory/ntap-20200717-0003/

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