CVE-2024-6387

Siemens ProductCERT Advisory SSA-082556

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.

Metrics

Severity
high
PoC (publicly reported)
8.1
Source: nvd-v3
99.9 %
Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
99.5 %
High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
Published
2021-09-26 00:00 UTC
CWE-364

Weakness classes (CWE)

  • CWE-364Base

    Signal Handler Race Condition

    The product uses a signal handler that introduces a race condition.

    cwe.mitre.org →

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. CVE Modified2026-08-31 17:17 UTC· secalert@redhat.com
    • Affected: Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2024/6xxx/CVE-2024-6387.json">CVE-2024-6387</a>
    • Reference: https://access.redhat.com/errata/RHSA-2024:4312
    • Reference: https://access.redhat.com/errata/RHSA-2024:4340
    • Reference: https://access.redhat.com/errata/RHSA-2024:4389
  2. CVE Modified2026-08-31 17:17 UTC· af854a3a-2127-422b-91ae-364da2661108
    • Reference: http://seclists.org/fulldisclosure/2024/Jul/18
    • Reference: http://seclists.org/fulldisclosure/2024/Jul/19
    • Reference: http://seclists.org/fulldisclosure/2024/Jul/20
    • Reference: http://www.openwall.com/lists/oss-security/2024/07/01/12
  3. CVE Modified2026-08-31 17:17 UTC· 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
    • Reference: https://cert-portal.siemens.com/productcert/html/ssa-082556.html
    • Reference: https://cert-portal.siemens.com/productcert/html/ssa-446545.html
    • Reference: https://cert-portal.siemens.com/productcert/html/ssa-082556.html
    • Reference: https://cert-portal.siemens.com/productcert/html/ssa-446545.html

Affected operating systems

  • bsd

    freebsd / freebsd13.2

  • bsd

    freebsd / freebsd13.3

  • bsd

    freebsd / freebsd14.0

  • bsd

    freebsd / freebsd14.1

  • bsd

    netbsd / netbsd

  • linux

    almalinux / almalinux9.0

  • linux

    amazon / amazon_linux2023.0

  • linux

    amazon / amazon_linux

  • linux

    ubuntu / awsbionic

  • linux

    ubuntu / awsjammy

  • linux

    ubuntu / awsnoble

  • linux

    ubuntu / awsresolute

  • linux

    ubuntu / awsxenial

  • linux

    ubuntu / aws-6.8jammy

  • linux

    ubuntu / aws-hwexenial

  • linux

    ubuntu / azurejammy

  • linux

    ubuntu / azurenoble

  • linux

    ubuntu / azureresolute

  • linux

    ubuntu / azurexenial

  • linux

    ubuntu / azure-4.15bionic

  • linux

    suse / basesystem_module15

  • linux

    debian / debian_linux10.0

  • linux

    debian / debian_linux11.0

  • linux

    debian / debian_linux12.0

Affected products

Products and version ranges extracted from the vendor/CERT advisory. A range like „<4.14.6“ implies the update recommendation „upgrade to 4.14.6 or later“.

  • android

    :linux_kernel::0

  • android

    :linux_kernel:Kernel

  • arista

    cloudvision_agni2024.4.0 – 2025.2.2

  • arista

    cloudvision_portal2024.2.0 – 2026.1.0

  • arista

    velocloud_edge4.5.0 – 6.4.1

  • arista

    velocloud_gateway

  • arista

    velocloud_orchestrator

  • bitnami

    java-min1.9.0

  • bitnami

    varnish6.1.0

  • bitnami

    varnish7.4.0

  • Dell

    ECS3.8.1.0-3.8.1.7

  • Dell

    NetWorkervProxy 19.14

  • Dell

    PowerScale OneFSNode Firmware Package 14.1

  • Dell

    Secure Connect GatewayAppliance 5.32.00.18

  • Dell

    Secure Connect Gateway< 5.36.00.16

    fixed in 5.36.00.16

  • Dell

    Secure Connect GatewayAppliance <5.32.00.18

  • gnu

    glibc2.35 – 2.37

  • gnu

    glibc

  • gnupg

    libgcrypt1.11.0 – 1.11.3

  • gnupg

    libgcrypt1.12.0 – 1.12.2

  • gnupg

    libgcrypt1.8.8 – 1.10.4

  • hackage

    xz-clib5.6.3

  • hackage

    xz-clib5.6.4

  • hackage

    xz-clib5.8.0

References & sources

Linked CVEs

Show 291 more CVEs

Linked advisories

IDCVE-2024-6387