CVE-2016-6210
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...
- Published
- Feb 13, 2017
- Updated
- May 29, 2026
- Assigning CNA
- mitre
- Evidence observed
- Jul 18, 2016
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NHigh · next 30 days
- Percentile
- 99.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
8- CVE-2016-6210-exploitExploit
Custom exploit written for enumerating usernames as per CVE-2016-6210
- CVE-2016-6210-ExploitExploit
OpenSSH Username Enumeration - CVE-2016-6210
PoC of cve-2016-6210
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