CVE-2015-5600
8.1
HIGH
CVSS 3.1
EPSS 78.4%
Description
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.
How to fix CVE-2015-5600
To remediate CVE-2015-5600, upgrade the affected package to a fixed version below.
- —upgrade to 1:6.9p1-1 or later
Is CVE-2015-5600 being exploited?
Likely — EPSS is 78.4%, placing CVE-2015-5600 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (1)
- from 0, < 1:6.9p1-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |