CVE-2019-18282

The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.

Published: 2020-01-16 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-18282 is rated Moderate Risk (52.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.60%). EPSS rose +1.92% over the last day, indicating growing attacker interest. Review affected assets and schedule 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-2019-18282

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 0.68% 2.60% +1.92%
2 2026-02-16 0.50% 0.68% +0.18%
3 2025-12-20 — 0.50% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-18282

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N 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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N 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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-18282

OS Trackers for CVE-2019-18282

vendor priority summary link
debian not yet assigned CVE-2019-18282 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-2019-18282
redhat medium — https://access.redhat.com/security/cve/CVE-2019-18282
suse medium CVE-2019-18282 severity moderate: SUSE including 57 source package names (bpftool-3.10.0-1160.11.1.el7, bpftool-4.18.0-193.el8, …), 320 product×package rows across 69 product lines (SUSE CaaS Platform 4.5, SUSE Enterprise Storage 7, … (69 product lines)): Known Not Affected 287, Fixed 33. https://www.suse.com/security/cve/CVE-2019-18282/
ubuntu medium CVE-2019-18282 medium priority: Ubuntu including 117 source packages (linux, linux-aws, …), 1274 status rows across 14 suites (bionic, disco, eoan, focal, groovy, hirsute, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 915, not-affected 179, released 162, ignored 18. https://ubuntu.com/security/CVE-2019-18282

Affected software / configurations for CVE-2019-18282

Vendor Product Version Raw CPE
linux linux_kernel >= 4.3, <= 5.3.10 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
netapp a700s_firmware — cpe:2.3:o:netapp:a700s_firmware:-:*:*:*:*:*:*:*
netapp 8300_firmware — cpe:2.3:o:netapp:8300_firmware:-:*:*:*:*:*:*:*
netapp 8700_firmware — cpe:2.3:o:netapp:8700_firmware:-:*:*:*:*:*:*:*
netapp a400_firmware — cpe:2.3:o:netapp:a400_firmware:-:*:*:*:*:*:*:*
netapp h610s_firmware — cpe:2.3:o:netapp:h610s_firmware:-:*:*:*:*:*:*:*
netapp active_iq_unified_manager — cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
netapp cloud_backup — cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
netapp data_availability_services — cpe:2.3:a:netapp:data_availability_services:-:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller >= 11.0.0, <= 11.70.1 cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*
netapp hci_management_node — cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
netapp solidfire — cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
netapp steelstore_cloud_integrated_storage — cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*

References for CVE-2019-18282

cvelogic Threat Intelligence