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 exist, which allows remote attackers to enumerate users by leveraging the timing difference…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 88.9%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 88.94% probability · 100th percentile
- Public exploits
- 2 in Exploit-DB · first 18 July 2016
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- openbsd/openssh
- Source
- cve@mitre.org
EPSS 88.9% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (2)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://seclists.org/fulldisclosure/2016/Jul/51Mailing List, Third Party Advisory
- http://www.debian.org/security/2016/dsa-3626
- http://www.securityfocus.com/bid/91812Third Party Advisory, VDB Entry
- 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-7.3Release Notes, Vendor Advisory
- http://seclists.org/fulldisclosure/2016/Jul/51Mailing List, Third Party Advisory
- http://www.debian.org/security/2016/dsa-3626
- http://www.securityfocus.com/bid/91812Third Party Advisory, VDB Entry
- 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-7.3Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.