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CVE-2024-6409

Medium

Elevated severity or exploit probability.

CVSS base
7.0 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
EPSS — probability of exploitation (30 days)
27.9%
98.0th percentile
CISA KEV
Not listed
Weakness / dates
CWE-364
Published 2024-07-08 · modified 2026-08-21

Description

A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.

References

Official: NVD · CVE.org