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…
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Public exploit
2 references of the record are tagged as an exploit or proof of concept: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
- 40136 (opens in a new tab)exploitx_transferred
- 40113 (opens in a new tab)exploitx_transferred
Timeline
ID reserved
By mitre
- 7 months later
· 7 months later
Published
- 9 years later
· 9 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Modified | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 88.9% · top 0.2% of all CVEs (8 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
n/a
- affected n/a
References (12)
- RHSA-2017:2563 (opens in a new tab)vendor-advisoryx_transferred
- 1036319 (opens in a new tab)vdb-entryx_transferred
- 20160714 opensshd - user enumeration (opens in a new tab)mailing-listx_transferred
- DSA-3626 (opens in a new tab)vendor-advisoryx_transferred
- 40136 (opens in a new tab)exploitx_transferred
- 40113 (opens in a new tab)exploitx_transferred
- https://www.openssh.com/txt/release-7.3 (opens in a new tab)x_transferred
- GLSA-201612-18 (opens in a new tab)vendor-advisoryx_transferred
- RHSA-2017:2029 (opens in a new tab)vendor-advisoryx_transferred
- 91812 (opens in a new tab)vdb-entryx_transferred
- https://security.netapp.com/advisory/ntap-20190206-0001/ (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-6210)Record last updated .