Public proof of concept

CVE-2016-6210

A public proof of concept exists; no exploitation attested.

Published2017-02-13
WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.

Timeline

dates in UTC

2017-02-1317:59CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-6210?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-6210?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

OpenSSH

Branch	Affected	Fixed in	Source
7.2	≤ 7.2	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.openssh.comRelease Notes · Vendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 7 repositories, unverifiedjustlce/CVE-2016-6210-Exploitgoomdan/CVE-2016-6210-exploitsamh4cks/CVE-2016-6210-OpenSSH-User-Enumerationwabiyagi/CVE-2016-6210nicoleman0/CVE-2016-6210-OpenSSHd-7.2p2

Sources

CISA-ADPSSVC decisionpoc2026-05-29
OpenCVESSVC decisionpoc—
CISA-ADPCVSS 3.15.92026-05-29
NVDCVSS 3.05.9read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
CISA-ADPweakness (CWE)CWE-2002026-05-29
NVDweakness (CWE)CWE-200read 2026-10-23
FIRST EPSSEPSS score88.9 %read 2026-10-23
PoC-in-GitHubproof of concept7read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2017-02-13
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-6210?

Is CVE-2016-6210 actively exploited?

A proof-of-concept exploit exists for CVE-2016-6210, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2016-6210?

CVE-2016-6210 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

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