CVE-2024-6387

8.1 HIGH

Published: July 01, 2024 Modified: September 30, 2025

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4312

Source: secalert@redhat.com

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4340

Source: secalert@redhat.com

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4389

Source: secalert@redhat.com

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4469

Source: secalert@redhat.com

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4474

Source: secalert@redhat.com

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4479

Source: secalert@redhat.com

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4484

Source: secalert@redhat.com

Third Party Advisory

https://access.redhat.com/security/cve/CVE-2024-6387

Source: secalert@redhat.com

Third Party Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=2294604

Source: secalert@redhat.com

Third Party Advisory

https://santandersecurityresearch.github.io/blog/sshing_the_masses.html

Source: secalert@redhat.com

Exploit Third Party Advisory

https://www.openssh.com/txt/release-9.8

Source: secalert@redhat.com

Release Notes Third Party Advisory

https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt

Source: secalert@redhat.com

Exploit Third Party Advisory

http://seclists.org/fulldisclosure/2024/Jul/18

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://seclists.org/fulldisclosure/2024/Jul/19

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://seclists.org/fulldisclosure/2024/Jul/20

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/01/12

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/01/13

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/02/1

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/03/1

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/03/11

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Mailing List

http://www.openwall.com/lists/oss-security/2024/07/03/2

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/03/3

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List Patch

http://www.openwall.com/lists/oss-security/2024/07/03/4

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/03/5

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/04/1

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/04/2

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Mailing List

http://www.openwall.com/lists/oss-security/2024/07/08/2

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Mailing List

http://www.openwall.com/lists/oss-security/2024/07/08/3

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/09/2

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/09/5

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Mailing List

http://www.openwall.com/lists/oss-security/2024/07/10/1

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Mailing List

http://www.openwall.com/lists/oss-security/2024/07/10/2

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/10/3

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/10/4

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/10/6

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/11/1

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/11/3

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/23/4

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/23/6

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/28/2

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/28/3

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

https://access.redhat.com/errata/RHSA-2024:4312

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4340

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4389

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4469

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4474

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4479

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://access.redhat.com/errata/RHSA-2024:4484

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://access.redhat.com/security/cve/CVE-2024-6387

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1/

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux/

Source: af854a3a-2127-422b-91ae-364da2661108

Press/Media Coverage Third Party Advisory

https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server

Source: af854a3a-2127-422b-91ae-364da2661108

Press/Media Coverage Third Party Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=2294604

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://explore.alas.aws.amazon.com/CVE-2024-6387.html

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://forum.vmssoftware.com/viewtopic.php?f=8&t=9132

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.asc

Source: af854a3a-2127-422b-91ae-364da2661108

Release Notes

https://github.com/AlmaLinux/updates/issues/629

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://github.com/Azure/AKS/issues/4379

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://github.com/PowerShell/Win32-OpenSSH/discussions/2248

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://github.com/PowerShell/Win32-OpenSSH/issues/2249

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://github.com/microsoft/azurelinux/issues/9555

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09

Source: af854a3a-2127-422b-91ae-364da2661108

Patch

https://github.com/oracle/oracle-linux/issues/149

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://github.com/rapier1/hpn-ssh/issues/87

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking

https://github.com/zgzhang/cve-2024-6387-poc

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY/

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List Release Notes

https://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.html

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List Patch

https://news.ycombinator.com/item?id=40843778

Source: af854a3a-2127-422b-91ae-364da2661108

Issue Tracking Patch

https://packetstorm.news/files/id/190587/

Source: af854a3a-2127-422b-91ae-364da2661108

Broken Link

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://santandersecurityresearch.github.io/blog/sshing_the_masses.html

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Third Party Advisory

https://security-tracker.debian.org/tracker/CVE-2024-6387

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://security.netapp.com/advisory/ntap-20240701-0001/

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://sig-security.rocky.page/issues/CVE-2024-6387/

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution/

Source: af854a3a-2127-422b-91ae-364da2661108

Press/Media Coverage Third Party Advisory

https://support.apple.com/kb/HT214118

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://support.apple.com/kb/HT214119

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://support.apple.com/kb/HT214120

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://ubuntu.com/security/CVE-2024-6387

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://ubuntu.com/security/notices/USN-6859-1

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-do

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.exploit-db.com/exploits/52269

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit

https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.asc

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.openssh.com/txt/release-9.8

Source: af854a3a-2127-422b-91ae-364da2661108

Release Notes Third Party Advisory

https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Third Party Advisory

https://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.html

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.suse.com/security/cve/CVE-2024-6387.html

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://www.theregister.com/2024/07/01/regresshion_openssh/

Source: af854a3a-2127-422b-91ae-364da2661108

Press/Media Coverage Third Party Advisory

https://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Third Party Advisory

91 reference(s) from NVD

Quick Stats

CVSS v3 Score

8.1 / 10.0

EPSS (Exploit Probability)

50.8%

98th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-364 CWE-362

Affected Vendors

redhat apple amazon openbsd suse sonicwall canonical arista freebsd netapp +3 more

Related CVEs

CVE-2025-69261 N/A

CVE-2025-69257 6.7

CVE-2025-69210 N/A

CVE-2025-66823 N/A

CVE-2025-50343 N/A