THREATPORT/VULNERABILITY/CVE-2015-5600
HIGH SEVERITY

CVE-2015-5600

Openssh vulnerability

CVSS
8.1
EPSS
9.4%
EPSS pct
95th
Exploited
No known
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
Affected vendor
Openbsd
Affected product
Openssh
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-264 — Permissions, Privileges, and Access Controls
  • CWE-400 — Uncontrolled Resource Consumption
Published
2015-08-03

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 9.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2015-5600

  • Confirm whether Openbsd Openssh is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2015-5600.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2015-5600

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2015-5600 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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