{"id":"CVE-2024-6409","url":"https://www.cyber-defence.io/tools/cve/CVE-2024-6409","generatedAt":"2026-10-28T00:52:39.797Z","title":"A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd).","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.","published":"2024-07-08T18:15:09.000Z","lastModified":"2026-10-15T03:17:06.000Z","status":"Deferred","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H"},"cwe":["CWE-364"],"affected":[],"epss":{"score":0.27935,"percentile":0.98087,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 27.9%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2024:4457","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:4613","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:4716","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:4910","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:4955","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:4960","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:5444","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2024-6409","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2295085","source":"secalert@redhat.com"},{"url":"http://www.openwall.com/lists/oss-security/2024/07/08/2","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2024/07/09/2","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2024/07/09/5","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2024/07/10/1","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2024/07/10/2","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:4457","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:4613","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:4716","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/cve/CVE-2024-6409","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://almalinux.org/blog/2024-07-09-cve-2024-6409/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2295085","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1227217","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://explore.alas.aws.amazon.com/CVE-2024-6409.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security-tracker.debian.org/tracker/CVE-2024-6409","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20240712-0003/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sig-security.rocky.page/issues/CVE-2024-6409/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ubuntu.com/security/CVE-2024-6409","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.suse.com/security/cve/CVE-2024-6409.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-6409","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}