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TI-2016-05326 Aliases CVE-2016-6210GHSA-f525-65h3-3qjh

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing…

Priority HIGH 69CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 16 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.88944 99th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by the CNA
Fix Partial Red Hat: 2 advisoriesRed Hat: 16 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openbsd:openssh:*:p2:*:*:*:*:*:*up to 7.2VulnerableOpenBSD
  • cpe:2.3:a:openbsd:openssh:*:p2:*:*:*:*:*:* Versions up to 7.2 Vulnerable ·OpenBSD

Remediation

Red Hat 2 advisories

  • RHSA-2017:2563 Released 2017-08-31 · Red Hat rating Moderate
    openssh security update
    • Red Hat Enterprise Linux Desktop (v. 6) openssh-5.3p1-123.el6_9, openssh-askpass-5.3p1-123.el6_9, openssh-clients-5.3p1-123.el6_9 +1
    • Red Hat Enterprise Linux Desktop Optional (v. 6) openssh-ldap-5.3p1-123.el6_9, pam_ssh_agent_auth-0.9.3-123.el6_9
    • Red Hat Enterprise Linux HPC Node (v. 6) openssh-5.3p1-123.el6_9, openssh-clients-5.3p1-123.el6_9, openssh-server-5.3p1-123.el6_9
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) openssh-askpass-5.3p1-123.el6_9, openssh-ldap-5.3p1-123.el6_9, pam_ssh_agent_auth-0.9.3-123.el6_9
    • Red Hat Enterprise Linux Server (v. 6) openssh-5.3p1-123.el6_9, openssh-askpass-5.3p1-123.el6_9, openssh-clients-5.3p1-123.el6_9 +1
    • Red Hat Enterprise Linux Server Optional (v. 6) openssh-ldap-5.3p1-123.el6_9, pam_ssh_agent_auth-0.9.3-123.el6_9, pam_ssh_agent_auth-0.9.3-123.el6_9.ppc
    • Red Hat Enterprise Linux Workstation (v. 6) openssh-5.3p1-123.el6_9, openssh-askpass-5.3p1-123.el6_9, openssh-clients-5.3p1-123.el6_9 +1
    • Red Hat Enterprise Linux Workstation Optional (v. 6) openssh-ldap-5.3p1-123.el6_9, pam_ssh_agent_auth-0.9.3-123.el6_9
  • RHSA-2017:2029 Released 2017-08-01 · Red Hat rating Moderate
    openssh security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) openssh-7.4p1-11.el7, openssh-askpass-7.4p1-11.el7, openssh-clients-7.4p1-11.el7 +2
    • Red Hat Enterprise Linux Client Optional (v. 7) openssh-cavs-7.4p1-11.el7, openssh-ldap-7.4p1-11.el7, openssh-server-sysvinit-7.4p1-11.el7 +1
    • Red Hat Enterprise Linux ComputeNode (v. 7) openssh-7.4p1-11.el7, openssh-clients-7.4p1-11.el7, openssh-keycat-7.4p1-11.el7 +1
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssh-askpass-7.4p1-11.el7, openssh-cavs-7.4p1-11.el7, openssh-ldap-7.4p1-11.el7 +2
    • Red Hat Enterprise Linux Server (v. 7) openssh-7.4p1-11.el7, openssh-askpass-7.4p1-11.el7, openssh-clients-7.4p1-11.el7 +2
    • Red Hat Enterprise Linux Server Optional (v. 7) openssh-cavs-7.4p1-11.el7, openssh-ldap-7.4p1-11.el7, openssh-server-sysvinit-7.4p1-11.el7 +2
    • Red Hat Enterprise Linux Workstation (v. 7) openssh-7.4p1-11.el7, openssh-askpass-7.4p1-11.el7, openssh-clients-7.4p1-11.el7 +2
    • Red Hat Enterprise Linux Workstation Optional (v. 7) openssh-cavs-7.4p1-11.el7, openssh-ldap-7.4p1-11.el7, openssh-server-sysvinit-7.4p1-11.el7 +1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2017:2029
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2017:2029
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2017:2029
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2017:2029
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2017:2029
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2017:2029
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2017:2029
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2017:2563
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2017:2029

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-6210
  2. 2026-10-03 Alias added: GHSA-f525-65h3-3qjh

References

Exploit 2

Advisory 6

Other 2

  • TI-2023-19792 The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2023-10601 OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during… CVSS 3.1MEDIUM 6.5
  • TI-2018-11033 OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying… CVSS 3.1MEDIUM 5.9
  • TI-2016-08105 Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4… CVSS 3.1HIGH 7.3
  • TI-2023-28040 In ssh in OpenSSH before 9.6, OS command injection might occur if a user name or host… CVSS 3.1MEDIUM 6.5
See all 145 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences