CVE-2024-6387

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

99.50% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.

NVD base score

8.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-15.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2024-07-01 12:37Z2 YR AGO

Last updated

2026-10-15 02:04Z14 DAYS AGO

Reserved

2024-06-27

Assigning CNA

redhat

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

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

Weaknesses

• CWE-364Signal Handler Race ConditionBase
• CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class

Data version

5.2

Document digest

dd72f461e7a8dcbb48668afc9fe5d08f85e94d9a304e36d12a47904f6bbfef11

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