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SRC: CVELISTV5 / SYNC: T-15M / LAG: 16M / REC: 386,755 / REV: C6-1C / V4

01 RecordSTATE: PUBLISHED

CVE-2024-6387

Openssh: regresshion - race condition in ssh allows rce/dos

HighPUBLISHEDCNA: redhat

CNA base score8.1 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

02 Description

CNA: redhat

Openssh: regresshion - race condition in ssh allows rce/dos

03 Exploitation and scoring

SRC: CISA, FIRST, NVD, RED HAT

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

99.51% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 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 2026-09-01.

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.

04 Metadata

SCHEMA: 5.2

Published

2024-07-01 12:37Z2 YR AGO

Last updated

2026-09-01 11:07Z3 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

Data version

5.2

Document digest

a9e0bf31502059ff284fd8e38e1a02bc78ebf1b2e4b2065c199fe0e8c5906728

05 Affected products

PAIRS: 15

VendorProductVersionsPlatforms

Red HatRed Hat Enterprise Linux 9Not specified—

Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP SolutionsNot specified—

Red HatRed Hat Enterprise Linux 9.2 Extended Update SupportNot specified—

Red HatRed Hat OpenShift Container Platform 4.13Not specified—

Red HatRed Hat OpenShift Container Platform 4.14Not specified—

Red HatRed Hat OpenShift Container Platform 4.15Not specified—

Red HatRed Hat OpenShift Container Platform 4.16Not specified—

Red HatRed Hat Ceph Storage 5Not specified—

Red HatRed Hat Ceph Storage 6Not specified—

Red HatRed Hat Ceph Storage 7Not specified—

Red HatRed Hat Enterprise Linux 10Not specified—

Red HatRed Hat Enterprise Linux 6Not specified—

Red HatRed Hat Enterprise Linux 7Not specified—

Red HatRed Hat Enterprise Linux 8Not specified—

Red HatRed Hat OpenShift Container Platform 4Not specified—

06 References

REFS: 81

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
www.openssh.comhttps://www.openssh.com/txt/release-9.8
www.qualys.comhttps://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt
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
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/03/11
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/03/2
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/03/3
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/03/4
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/03/5
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/04/1
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/04/2
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/08/2
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/08/3
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/09/2
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/09/5
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/10/1
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/10/2
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/10/3
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/10/4
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/10/6
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/11/1
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/11/3
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/23/4
www.openwall.comhttp://www.openwall.com/lists/oss-security/2024/07/23/6
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/
arstechnica.comhttps://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux/
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