CVE-2016-6210 EXPLOIT
5.9
MEDIUM · CVSS 3.1 · EPSS 88.9% (pctl 100)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 5.9 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| EPSS | 88.94% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-200 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2017-02-13 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| openbsd | openssh |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | OpenSSH 7.2p2 - Username Enumeration | 2016-07-20 |
| exploit-db | OpenSSHd 7.2p2 - Username Enumeration | 2016-07-18 |
References
- http://seclists.org/fulldisclosure/2016/Jul/51
- http://www.debian.org/security/2016/dsa-3626
- http://www.securityfocus.com/bid/91812
- http://www.securitytracker.com/id/1036319
- https://access.redhat.com/errata/RHSA-2017:2029
- https://access.redhat.com/errata/RHSA-2017:2563
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://security.gentoo.org/glsa/201612-18
- https://security.netapp.com/advisory/ntap-20190206-0001/
- https://www.exploit-db.com/exploits/40113/
- https://www.exploit-db.com/exploits/40136/
- https://www.openssh.com/txt/release-7.3
- http://seclists.org/fulldisclosure/2016/Jul/51
- http://www.debian.org/security/2016/dsa-3626
- http://www.securityfocus.com/bid/91812
- http://www.securitytracker.com/id/1036319
- https://access.redhat.com/errata/RHSA-2017:2029
- https://access.redhat.com/errata/RHSA-2017:2563
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://security.gentoo.org/glsa/201612-18
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