# CVE-2024-6387 — Red Hat Enterprise Linux 9 > As of 2026-09-01, CVE-2024-6387 is a HIGH-severity vulnerability in Red Hat Enterprise Linux 9, CVSS v3.1 8.1, EPSS 99.5% (99.9th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2024-6387, most recently “EtherHiding: Blockchain-Based C2 on Polygon Fuels ClickFix Backdoor + Banking-Trojan Extension Campaign Adopted by Criminal, North Korean, and Iran-Linked Actors”. **Last updated:** 2026-09-01 ## What is CVE-2024-6387? 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. The record classifies CVE-2024-6387 under weakness class [CWE-364](https://cwe.mitre.org/data/definitions/364.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 813 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 8.1 — HIGH (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **EPSS (FIRST):** 99.5% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs - **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog - **Threadlinqs priority:** 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability - **Published:** 2024-07-01, last modified 2026-09-01 ## Is CVE-2024-6387 being exploited? Weaponised exploit code for CVE-2024-6387 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. - [xaitax/CVE-2024-6387_Check](https://github.com/xaitax/CVE-2024-6387_Check) (github) - [zgzhang/cve-2024-6387-poc](https://github.com/zgzhang/cve-2024-6387-poc) (github) - [acrono/cve-2024-6387-poc](https://github.com/acrono/cve-2024-6387-poc) (github) - [Karmakstylez/CVE-2024-6387](https://github.com/Karmakstylez/CVE-2024-6387) (github) - [lflare/cve-2024-6387-poc](https://github.com/lflare/cve-2024-6387-poc) (github) - [l0n3m4n/CVE-2024-6387](https://github.com/l0n3m4n/CVE-2024-6387) (github) - [filipi86/CVE-2024-6387-Vulnerability-Checker](https://github.com/filipi86/CVE-2024-6387-Vulnerability-Checker) (github) - [xonoxitron/regreSSHion](https://github.com/xonoxitron/regreSSHion) (github) ## Affected products and versions - **Red Hat**: Enterprise Linux 9, Enterprise Linux 9.0 Update Services for SAP Solutions, Enterprise Linux 9.2 Extended Update Support, OpenShift Container Platform 4.13, OpenShift Container Platform 4.14, OpenShift Container Platform 4.15, OpenShift Container Platform 4.16, Ceph Storage 5, Ceph Storage 6, Ceph Storage 7, Enterprise Linux 10, Enterprise Linux 6 ## How to fix CVE-2024-6387 No vendor patch reference has been recorded for CVE-2024-6387 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise. ## Threat activity tracking CVE-2024-6387 2 tracked threats in the Threadlinqs corpus reference CVE-2024-6387, either in the campaign’s CVE list or as an indicator on the campaign record. - [EtherHiding: Blockchain-Based C2 on Polygon Fuels ClickFix Backdoor + Banking-Trojan Extension Campaign Adopted by Criminal, North Korean, and Iran-Linked Actors](https://intel.threadlinqs.com/threat/TL-2026-2273) — HIGH · 2026-09-01 - [PATCHCORD, SHEETCORD & HACKERAI C2 Agent: New Malware Cluster Targets Afghan Telecom and South Asian Critical Infrastructure (APT36-linked)](https://intel.threadlinqs.com/threat/TL-2026-2006) — HIGH · 2026-08-13 ## Sources Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-09-03. **Vendor advisory and patch** - [access.redhat.com — vendor advisory](https://access.redhat.com/errata/RHSA-2024:4312) - [access.redhat.com — vendor advisory (RHSA 2024:4340)](https://access.redhat.com/errata/RHSA-2024:4340) - [access.redhat.com — vendor advisory (RHSA 2024:4389)](https://access.redhat.com/errata/RHSA-2024:4389) - [access.redhat.com — vendor advisory (RHSA 2024:4469)](https://access.redhat.com/errata/RHSA-2024:4469) - [access.redhat.com — vendor advisory (RHSA 2024:4474)](https://access.redhat.com/errata/RHSA-2024:4474) **Third-party advisory** - [access.redhat.com — vdb entry](https://access.redhat.com/security/cve/CVE-2024-6387) - [bugzilla.redhat.com — issue tracking](https://bugzilla.redhat.com/show_bug.cgi?id=2294604) **Other references** - [santandersecurityresearch.github.io](https://santandersecurityresearch.github.io/blog/sshing_the_masses.html) - [openssh.com](https://www.openssh.com/txt/release-9.8) - [qualys.com](https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt) _Showing 10 of 12 recorded references._ Canonical: https://intel.threadlinqs.com/cve/CVE-2024-6387 Full detection coverage and IOCs for threats exploiting CVE-2024-6387 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp