Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2019-6470

There had existed in one of the ISC BIND libraries a bug in a function that was used by dhcpd when operating in DHCPv6 mode. There was also a bug in dhcpd relating to the use of this function per its documentation, but the bug in the library function prevented this from causing any harm. All releases of dhcpd from ISC contain copies of this, and other, BIND libraries in combinations that have been tested prior to release and are known to not present issues like this. Some third-party packagers of ISC software have modified the dhcpd source, BIND source, or version matchup in ways that create the crash potential. Based on reports available to ISC, the crash probability is large and no analysis has been done on how, or even if, the probability can be manipulated by an attacker. Affects: Builds of dhcpd versions prior to version 4.4.1 when using BIND versions 9.11.2 or later, or BIND versions with specific bug fixes backported to them. ISC does not have access to comprehensive version lists for all repackagings of dhcpd that are vulnerable. In particular, builds from other vendors may also be affected. Operators are advised to consult their vendor documentation.

  • Published: Nov 1, 2019
  • Updated: Nov 9, 2025
  • CVE: CVE-2019-6470
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 6.5
  • AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P

No CWE or OWASP classifications available.

Software From Fixed in
isc / dhcpd - 4.4.1
redhat / enterprise_linux_desktop 7.0 7.0.x
redhat / enterprise_linux_workstation 7.0 7.0.x
redhat / enterprise_linux_server 7.0 7.0.x
opensuse / leap 15.0 15.0.x
opensuse / leap 15.1 15.1.x
redhat / enterprise_linux_for_scientific_computing 7.0 7.0.x
redhat / enterprise_linux_for_power_little_endian 7.0 7.0.x
redhat / enterprise_linux_for_power_big_endian 7.0 7.0.x
redhat / enterprise_linux_for_ibm_z_systems 7.0 7.0.x
redhat / enterprise_linux 8.0 8.0.x
redhat / enterprise_linux_for_ibm_z_systems 8.0 8.0.x
redhat / enterprise_linux_for_power_little_endian 8.0 8.0.x
redhat / enterprise_linux_eus 8.1 8.1.x
redhat / enterprise_linux_eus 8.2 8.2.x
redhat / enterprise_linux_eus 8.4 8.4.x
redhat / enterprise_linux_server_aus 8.2 8.2.x
redhat / enterprise_linux_server_aus 8.4 8.4.x
redhat / enterprise_linux_server_tus 8.2 8.2.x
redhat / enterprise_linux_server_tus 8.4 8.4.x
redhat / enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.1 8.1.x
redhat / enterprise_linux_for_arm_64 8.0 8.0.x
redhat / enterprise_linux_eus 8.6 8.6.x
redhat / enterprise_linux_eus 8.8 8.8.x
redhat / enterprise_linux_server_aus 8.6 8.6.x
redhat / enterprise_linux_for_ibm_z_systems_eus 8.6_s390x 8.6_s390x.x
redhat / enterprise_linux_for_ibm_z_systems_eus 8.8_s390x 8.8_s390x.x
redhat / enterprise_linux_for_power_little_endian_eus 8.4_ppc64le 8.4_ppc64le.x
redhat / enterprise_linux_for_power_little_endian_eus 8.6_ppc64le 8.6_ppc64le.x
redhat / enterprise_linux_for_power_little_endian_eus 8.8_ppc64le 8.8_ppc64le.x
redhat / enterprise_linux_server_tus 8.6 8.6.x
redhat / enterprise_linux_server_tus 8.8 8.8.x
redhat / enterprise_linux_for_arm_64_eus 8.8_aarch64 8.8_aarch64.x
redhat / enterprise_linux_for_arm_64_eus 8.6_aarch64 8.6_aarch64.x
redhat / enterprise_linux_for_arm_64_eus 8.4_aarch64 8.4_aarch64.x
redhat / enterprise_linux_for_arm_64_eus 8.2_aarch64 8.2_aarch64.x
redhat / enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.2 8.2.x
redhat / enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.4 8.4.x
redhat / enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.6 8.6.x
redhat / enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.8 8.8.x
redhat / enterprise_linux_update_services_for_sap_solutions 8.1 8.1.x
redhat / enterprise_linux_update_services_for_sap_solutions 8.2 8.2.x
redhat / enterprise_linux_update_services_for_sap_solutions 8.4 8.4.x
redhat / enterprise_linux_update_services_for_sap_solutions 8.6 8.6.x
redhat / enterprise_linux_update_services_for_sap_solutions 8.8 8.8.x
redhat / enterprise_linux_for_ibm_z_systems_eus 8.1_s390x 8.1_s390x.x
redhat / enterprise_linux_for_ibm_z_systems_eus 8.2_s390x 8.2_s390x.x
redhat / enterprise_linux_for_ibm_z_systems_eus 8.4_s390x 8.4_s390x.x
redhat / enterprise_linux_for_power_little_endian_eus 8.1_ppc64le 8.1_ppc64le.x
redhat / enterprise_linux_for_power_little_endian_eus 8.2_ppc64le 8.2_ppc64le.x
redhat / enterprise_linux_for_arm_64_eus 8.1_aarch64 8.1_aarch64.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.