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: 2018-01-03 Last update: 2025-01-03 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-18017 is rated High Risk (78.8/100): CVSS Critical severity, with high exploitation likelihood (EPSS 52.19%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +17.88% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-18017

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 34.31% 52.19% +17.88%
2 2026-03-26 40.71% 34.31% -6.40%
3 2026-03-17 — 40.71% —

Full EPSS history (33 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18017

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2017-18017

OS Trackers for CVE-2017-18017

vendor priority summary link
debian not yet assigned CVE-2017-18017 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-18017
redhat medium — https://access.redhat.com/security/cve/CVE-2017-18017
suse medium CVE-2017-18017 severity moderate: SUSE including 228 source package names (cluster-md-kmp-default-4.4.114-92.64.1, cluster-md-kmp-default-4.4.114-94.11.3, …), 526 product×package rows across 86 product lines (SUSE CaaS Platform 4.0, SUSE CaaS Platform 4.5, … (86 product lines)): Fixed 317, Known Not Affected 209. https://www.suse.com/security/cve/CVE-2017-18017/
ubuntu medium CVE-2017-18017 medium priority: Ubuntu including 97 source packages (linux, linux-aws, …), 863 status rows across 12 suites (artful, bionic, cosmic, focal, jammy, noble, oracular, plucky, trusty, upstream, xenial, zesty): DNE 588, not-affected 149, released 108, ignored 18. https://ubuntu.com/security/CVE-2017-18017

Affected software / configurations for CVE-2017-18017

Vendor Product Version Raw CPE
linux linux_kernel >= 3.2, < 3.2.99 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.3, < 3.10.108 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.11, < 3.16.54 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.17, < 3.18.60 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.19, < 4.1.43 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.2, < 4.4.76 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.5, < 4.9.36 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.10, < 4.11 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
arista eos 4.20.1fx-virtual-router cpe:2.3:o:arista:eos:4.20.1fx-virtual-router:*:*:*:*:*:*:*
f5 arx >= 6.2.0, <= 6.4.0 cpe:2.3:a:f5:arx:*:*:*:*:*:*:*:*
suse caas_platform — cpe:2.3:a:suse:caas_platform:*:*:*:*:*:*:*:*
suse linux_enterprise_debuginfo 11 cpe:2.3:a:suse:linux_enterprise_debuginfo:11:sp3:*:*:*:*:*:*
suse linux_enterprise_debuginfo 11 cpe:2.3:a:suse:linux_enterprise_debuginfo:11:sp4:*:*:*:*:*:*
suse linux_enterprise_module_for_public_cloud 12 cpe:2.3:a:suse:linux_enterprise_module_for_public_cloud:12:*:*:*:*:*:*:*
suse linux_enterprise_point_of_sale 11 cpe:2.3:a:suse:linux_enterprise_point_of_sale:11:sp3:*:*:*:*:*:*
suse openstack_cloud 6 cpe:2.3:a:suse:openstack_cloud:6:*:*:*:*:*:*:*
opensuse leap 42.3 cpe:2.3:o:opensuse:leap:42.3:*:*:*:*:*:*:*
suse linux_enterprise_desktop 12 cpe:2.3:o:suse:linux_enterprise_desktop:12:sp2:*:*:*:*:*:*
suse linux_enterprise_desktop 12 cpe:2.3:o:suse:linux_enterprise_desktop:12:sp3:*:*:*:*:*:*
suse linux_enterprise_high_availability 12 cpe:2.3:o:suse:linux_enterprise_high_availability:12:sp2:*:*:*:*:*:*
suse linux_enterprise_high_availability 12 cpe:2.3:o:suse:linux_enterprise_high_availability:12:sp3:*:*:*:*:*:*
suse linux_enterprise_high_availability_extension 11 cpe:2.3:o:suse:linux_enterprise_high_availability_extension:11:sp4:*:*:*:*:*:*
suse linux_enterprise_live_patching 12 cpe:2.3:o:suse:linux_enterprise_live_patching:12:-:*:*:*:*:*:*
suse linux_enterprise_live_patching 12 cpe:2.3:o:suse:linux_enterprise_live_patching:12:sp3:*:*:*:*:*:*
suse linux_enterprise_real_time_extension 11 cpe:2.3:o:suse:linux_enterprise_real_time_extension:11:sp4:*:*:*:*:*:*
suse linux_enterprise_real_time_extension 12 cpe:2.3:o:suse:linux_enterprise_real_time_extension:12:sp2:*:*:*:*:*:*
suse linux_enterprise_real_time_extension 12 cpe:2.3:o:suse:linux_enterprise_real_time_extension:12:sp3:*:*:*:*:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:sp3:*:*:ltss:*:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:sp4:*:*:*:*:*:*
suse linux_enterprise_server 12 cpe:2.3:o:suse:linux_enterprise_server:12:*:*:*:ltss:*:*:*
suse linux_enterprise_server 12 cpe:2.3:o:suse:linux_enterprise_server:12:sp1:*:*:*:sap:*:*
suse linux_enterprise_server 12 cpe:2.3:o:suse:linux_enterprise_server:12:sp1:*:*:ltss:*:*:*
suse linux_enterprise_server 12 cpe:2.3:o:suse:linux_enterprise_server:12:sp2:*:*:*:*:*:*
suse linux_enterprise_server 12 cpe:2.3:o:suse:linux_enterprise_server:12:sp2:*:*:*:*:raspberry_pi:*
suse linux_enterprise_server 12 cpe:2.3:o:suse:linux_enterprise_server:12:sp3:*:*:-:-:*:*
suse linux_enterprise_software_development_kit 11 cpe:2.3:o:suse:linux_enterprise_software_development_kit:11:sp4:*:*:*:*:*:*
suse linux_enterprise_software_development_kit 12 cpe:2.3:o:suse:linux_enterprise_software_development_kit:12:sp2:*:*:*:*:*:*
suse linux_enterprise_software_development_kit 12 cpe:2.3:o:suse:linux_enterprise_software_development_kit:12:sp3:*:*:*:*:*:*
suse linux_enterprise_workstation_extension 12 cpe:2.3:o:suse:linux_enterprise_workstation_extension:12:sp2:*:*:*:*:*:*
suse linux_enterprise_workstation_extension 12 cpe:2.3:o:suse:linux_enterprise_workstation_extension:12:sp3:*:*:*:*:*:*
openstack cloud_magnum_orchestration 7 cpe:2.3:a:openstack:cloud_magnum_orchestration:7:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
redhat mrg_realtime 2.0 cpe:2.3:a:redhat:mrg_realtime:2.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 6.0 cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.3 cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.4 cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.6 cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.7 cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:*
redhat enterprise_linux_for_real_time 7 cpe:2.3:o:redhat:enterprise_linux_for_real_time:7:*:*:*:*:*:*:*
redhat enterprise_linux_for_real_time_for_nfv 7 cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv:7:*:*:*:*:*:*:*
redhat enterprise_linux_server 6.0 cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.7 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.7 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0 cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

References for CVE-2017-18017

URL Tags
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2638fd0f92d4397884fd991d8f4925cb3f081901 Patch Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00008.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00013.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00015.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00038.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00047.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00030.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00067.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00070.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-03/msg00072.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2018-04/msg00014.html Mailing List Third Party Advisory
http://patchwork.ozlabs.org/patch/746618/ Patch Third Party Advisory
http://www.securityfocus.com/bid/102367 Broken Link Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-3583-1 Third Party Advisory
http://www.ubuntu.com/usn/USN-3583-2 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0676 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1062 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1130 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1170 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1319 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1737 Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1739765 Issue Tracking Third Party Advisory
https://github.com/torvalds/linux/commit/2638fd0f92d4397884fd991d8f4925cb3f081901 Patch Third Party Advisory
https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/05/msg00000.html Mailing List Third Party Advisory
https://lkml.org/lkml/2017/4/2/13 Third Party Advisory
https://support.f5.com/csp/article/K18352029 Third Party Advisory
https://usn.ubuntu.com/3583-1/ Third Party Advisory
https://usn.ubuntu.com/3583-2/ Third Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/4577-security-advisory-34 Mitigation Third Party Advisory
https://www.debian.org/security/2018/dsa-4187 Third Party Advisory
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.36 Release Notes Vendor Advisory
https://security.netapp.com/advisory/ntap-20250103-0010/
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