CVE-2016-20012

What it is

OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

5.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-09-15 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:43 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 5.3% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-09-15 20:15 UTC

Last modified

2026-06-17 00:43 UTC

Exploit probability

5.3% · EPSS, next 30 days

Weakness

CWE-203

Record status

Modified

Affected

• Openbsd OpenSSH ≤ 8.7
• Netapp Clustered Data Ontap
• Netapp Hci Management Node
• Netapp Ontap Select Deploy Administration Utility
• Netapp Solidfire

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

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-2016-20012.md and follow it. Check whether this project is affected by CVE-2016-20012. 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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