# CVE-2024-6387

## Summary

- **CVE ID:** CVE-2024-6387
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-364
- **Published:** Jul 1, 2024
- **Last Modified:** Sep 1, 2026

## Description

A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.

## Affected Products

- Unknown product (8.5p1)
- Red Hat — Red Hat Enterprise Linux 9 (0:8.7p1-38.el9_4.1)
- Red Hat — Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (0:8.7p1-12.el9_0.1)
- Red Hat — Red Hat Enterprise Linux 9.2 Extended Update Support (0:8.7p1-30.el9_2.4)
- Red Hat — Red Hat OpenShift Container Platform 4.13 (413.92.202407091321-0)
- Red Hat — Red Hat OpenShift Container Platform 4.14 (414.92.202407091253-0)
- Red Hat — Red Hat OpenShift Container Platform 4.15 (415.92.202407091355-0)
- Red Hat — Red Hat OpenShift Container Platform 4.16 (416.94.202407081958-0)

## References

- [CNA](https://access.redhat.com/errata/RHSA-2024:4312)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4340)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4389)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4469)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4474)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4479)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4484)
- [CNA](https://access.redhat.com/security/cve/CVE-2024-6387)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2294604)
- [CNA](https://santandersecurityresearch.github.io/blog/sshing_the_masses.html)
- [CNA](https://www.openssh.com/txt/release-9.8)
- [CNA](https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt)
- [CVE](https://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387)
- [CVE](https://www.exploit-db.com/exploits/52269)
- [CVE](https://packetstorm.news/files/id/190587/)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/01/12)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/01/13)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/02/1)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/03/1)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/03/11)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/03/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/03/3)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/03/4)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/03/5)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/04/1)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/04/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/08/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/08/3)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/09/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/09/5)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/10/1)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/10/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/10/3)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/10/4)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/10/6)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/11/1)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/11/3)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/23/4)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/23/6)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/28/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/07/28/3)
- [CVE](https://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1/)
- [CVE](https://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux/)
- [CVE](https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server)
- [CVE](https://explore.alas.aws.amazon.com/CVE-2024-6387.html)
- [CVE](https://forum.vmssoftware.com/viewtopic.php?f=8&t=9132)
- [CVE](https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.asc)
- [CVE](https://github.com/AlmaLinux/updates/issues/629)
- [CVE](https://github.com/Azure/AKS/issues/4379)
- [CVE](https://github.com/PowerShell/Win32-OpenSSH/discussions/2248)
- [CVE](https://github.com/PowerShell/Win32-OpenSSH/issues/2249)
- [CVE](https://github.com/microsoft/azurelinux/issues/9555)
- [CVE](https://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09)
- [CVE](https://github.com/oracle/oracle-linux/issues/149)
- [CVE](https://github.com/rapier1/hpn-ssh/issues/87)
- [CVE](https://github.com/zgzhang/cve-2024-6387-poc)
- [CVE](https://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY/)
- [CVE](https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html)
- [CVE](https://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.html)
- [CVE](https://news.ycombinator.com/item?id=40843778)
- [CVE](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010)
- [CVE](https://security-tracker.debian.org/tracker/CVE-2024-6387)
- [CVE](https://security.netapp.com/advisory/ntap-20240701-0001/)
- [CVE](https://sig-security.rocky.page/issues/CVE-2024-6387/)
- [CVE](https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution/)
- [CVE](https://ubuntu.com/security/CVE-2024-6387)
- [CVE](https://ubuntu.com/security/notices/USN-6859-1)
- [CVE](https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-do)
- [CVE](https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100)
- [CVE](https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.asc)
- [CVE](https://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.html)
- [CVE](https://www.suse.com/security/cve/CVE-2024-6387.html)
- [CVE](https://www.theregister.com/2024/07/01/regresshion_openssh/)
- [CVE](https://support.apple.com/kb/HT214119)
- [CVE](https://support.apple.com/kb/HT214118)
- [CVE](https://support.apple.com/kb/HT214120)
- [CVE](http://seclists.org/fulldisclosure/2024/Jul/20)
- [CVE](http://seclists.org/fulldisclosure/2024/Jul/18)
- [CVE](http://seclists.org/fulldisclosure/2024/Jul/19)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-446545.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-082556.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 99.51%
- **EPSS Percentile:** 99.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._