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CVE-2015-5600

8.1
HIGHCVSS v3.1 Base Score
74.50%
HIGH RiskEPSS (99th percentile)

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.

Published: 8/3/2015
Modified: 5/27/2026
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Vulnerability Summary

CVSS v3 Score

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2 Score

8.5

AV:N/AC:L/Au:N/C:P/I:N/A:C

EPSS Score (Exploitation Probability)

74.50%HIGH Exploitation Risk
99th percentile

This vulnerability has a 74.50% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.

CWE Classification

Related Vulnerabilities

Same Weakness Type(CWE-264)

Similar SeverityHIGH