VIR Vulnerability Intelligence Relay

CVE-2016-6210

medium
Published 2017-02-13 · Modified 2026-05-29
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4 NEW
—
not yet in upstream
VIR risk
6.9

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.

Predictions

Exploit likelihood
100%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-40136 remote linux
0_o · 2016-07-20

OpenSSH 7.2p2 - Username Enumeration

Source code queued for fetch — refresh in a moment.
EDB-40113 remote linux
Eddie Harari · 2016-07-18

OpenSSHd 7.2p2 - Username Enumeration

Source code queued for fetch — refresh in a moment.

Metasploit modules

auxiliary_scanner/ssh/ssh_enumusers rank 300
SSH Username Enumeration
Source code queued for fetch — refresh in a moment.

OS impact
suse SUSE Affected 1 release
VersionStatusFixed in
— Affected —
debian Debian Fixed 5 releases
VersionStatusFixed in
trixie Fixed 1:7.2p2-6
sid Fixed 1:7.2p2-6
forky Fixed 1:7.2p2-6
bullseye Fixed 1:7.2p2-6
bookworm Fixed 1:7.2p2-6

Application impact
VendorProductVersionsFixed
openbsdopenssh{"endIncluding":"7.2"}

References

CWEs

CWE-200

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.