Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2017-18017

The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.

  • Published: Jan 3, 2018
  • Updated: Nov 9, 2025
  • CVE: CVE-2017-18017
  • Severity: Critical
  • Exploit:

CVSS v3:

  • Severity: Critical
  • Score: 9.8
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

  • Severity: High
  • Score: 10
  • AV:N/AC:L/Au:N/C:C/I:C/A:C

CWEs:

Software From Fixed in
linux / linux_kernel 4.10 4.11
linux / linux_kernel 3.2 3.2.99
linux / linux_kernel 3.3 3.10.108
linux / linux_kernel 3.11 3.16.54
linux / linux_kernel 3.17 3.18.60
linux / linux_kernel 3.19 4.1.43
linux / linux_kernel 4.2 4.4.76
linux / linux_kernel 4.5 4.9.36
debian / debian_linux 8.0 8.0.x
debian / debian_linux 7.0 7.0.x
f5 / arx 6.2.0 6.4.0.x
suse / linux_enterprise_server 11-sp4 11-sp4.x
suse / linux_enterprise_software_development_kit 12-sp2 12-sp2.x
suse / linux_enterprise_debuginfo 11-sp3 11-sp3.x
suse / linux_enterprise_desktop 12-sp2 12-sp2.x
suse / linux_enterprise_server 11-sp3 11-sp3.x
suse / linux_enterprise_server 12-sp2 12-sp2.x
suse / linux_enterprise_real_time_extension 11-sp4 11-sp4.x
suse / linux_enterprise_software_development_kit 11-sp4 11-sp4.x
suse / linux_enterprise_debuginfo 11-sp4 11-sp4.x
suse / linux_enterprise_server 12-sp1 12-sp1.x
suse / linux_enterprise_high_availability 12-sp2 12-sp2.x
suse / linux_enterprise_desktop 12-sp3 12-sp3.x
suse / linux_enterprise_server 12 12.x
opensuse / leap 42.3 42.3.x
suse / linux_enterprise_software_development_kit 12-sp3 12-sp3.x
suse / linux_enterprise_module_for_public_cloud 12 12.x
suse / openstack_cloud 6 6.x
suse / linux_enterprise_point_of_sale 11-sp3 11-sp3.x
suse / linux_enterprise_server 12-sp3 12-sp3.x
suse / linux_enterprise_high_availability_extension 11-sp4 11-sp4.x
suse / linux_enterprise_real_time_extension 12-sp2 12-sp2.x
suse / linux_enterprise_live_patching 12 12.x
suse / linux_enterprise_workstation_extension 12-sp2 12-sp2.x
suse / caas_platform - -
suse / linux_enterprise_live_patching 12-sp3 12-sp3.x
suse / linux_enterprise_high_availability 12-sp3 12-sp3.x
suse / linux_enterprise_workstation_extension 12-sp3 12-sp3.x
suse / linux_enterprise_real_time_extension 12-sp3 12-sp3.x
openstack / cloud_magnum_orchestration 7 7.x
canonical / ubuntu_linux 14.04 14.04.x
canonical / ubuntu_linux 12.04 12.04.x
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
redhat / enterprise_linux_for_real_time 7 7.x
redhat / enterprise_linux_desktop 6.0 6.0.x
redhat / enterprise_linux_for_real_time_for_nfv 7 7.x
redhat / enterprise_linux_server 6.0 6.0.x
redhat / enterprise_linux_workstation 6.0 6.0.x
redhat / enterprise_linux_server_tus 7.3 7.3.x
redhat / enterprise_linux_server_aus 7.3 7.3.x
redhat / enterprise_linux_server_aus 7.4 7.4.x
redhat / enterprise_linux_server_tus 7.4 7.4.x
redhat / enterprise_linux_eus 7.3 7.3.x
redhat / enterprise_linux_eus 7.4 7.4.x
redhat / enterprise_linux_server_tus 7.6 7.6.x
redhat / enterprise_linux_server_aus 7.6 7.6.x
redhat / enterprise_linux_eus 7.6 7.6.x
redhat / mrg_realtime 2.0 2.0.x
redhat / enterprise_linux_server_aus 7.7 7.7.x
redhat / enterprise_linux_server_tus 7.7 7.7.x
redhat / enterprise_linux_eus 7.7 7.7.x
arista / eos 4.20.1fx-virtual-router 4.20.1fx-virtual-router.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.