CVE-2016-20012
OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product
- Score
- CVSS 3.1 5.3 Medium
- Status
- Modified - cve@mitre.org
- Published
- 2021-09-15
- Last modified
- 2026-05-29
- Weaknesses
- CWE-203
Affected products
- Clustered Data Ontap (Netapp)
- Hci Management Node (Netapp)
- Ontap Select Deploy Administration Utility (Netapp)
- Solidfire (Netapp)
- Openssh (Openbsd)
References
- https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265
- https://github.com/openssh/openssh-portable/pull/270
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
- https://rushter.com/blog/public-ssh-keys/
- https://security.netapp.com/advisory/ntap-20211014-0005/
- https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak
- https://www.openwall.com/lists/oss-security/2018/08/24/1
