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Vulnerability record · CVE-2020-14002 · published 29 June 2020

CVE-2020-14002: Putty observable discrepancy vulnerability

Putty · Putty

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).

5.9 CVSS 3.1 Medium EPSS 3.1% · top 12.6% CWE-203 · Observable discrepancy
5.9CVSS 3.1 base score, v2 4.3
3.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

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).

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26TACCSQYYCPWAJYNAUIXJG
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JPV4A77EDCT4BTFO5BE26ZH
https://lists.tartarus.org/pipermail/putty-announce/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20200717-0003/ Third Party Advisory
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Release NotesThird Party Advisory
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angri Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26TACCSQYYCPWAJYNAUIXJG
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JPV4A77EDCT4BTFO5BE26ZH
https://lists.tartarus.org/pipermail/putty-announce/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20200717-0003/ Third Party Advisory
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Release NotesThird Party Advisory
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angri Third Party Advisory

Track CVE-2020-14002 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-14002), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.