What is CVE-2019-11867?

CVE-2019-11867 is a medium-severity vulnerability in Realtek Ndis, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2020-02-12.

How severe is CVE-2019-11867?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Realtek Ndis

CVE-2019-11867

Realtek NDIS driver rt640x64.sys, file version 10.1.505.2015, fails to do any size checking on an input buffer from user space, which the driver assumes has a size greater than zero bytes. To exploit this vulnerability, an attacker must send an IRP with a system buffer size of 0.

Published 2020-02-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (18.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Realtek Ndis — versions 10.1.505.2015

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

downwithup.github.io/CVEPosts.html (Third Party Advisory)
www.realtek.cz/realtek-network-drivers.html (Vendor Advisory)

Frequently asked questions

What is CVE-2019-11867?: CVE-2019-11867 is a medium-severity vulnerability in Realtek Ndis, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2020-02-12.
How severe is CVE-2019-11867?: Medium severity. CVSS v3 base score is 5.5 out of 10.