CVE-2020-14002

What it is

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).

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure.

Exploit odds

3.1% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2020-06-29 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:54 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.1% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2020-06-29 18:15 UTC

Last modified

2026-06-17 02:54 UTC

Exploit probability

3.1% · EPSS, next 30 days

Weakness

CWE-203

Record status

Modified

Affected

• Putty ≤ 0.73
• Netapp Oncommand Unified Manager Core Package
• Fedoraproject Fedora 31
• Fedoraproject Fedora 32

Attack profile CVSS 3.1 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-14002.md and follow it. Check whether this project is affected by CVE-2020-14002. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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