What is CVE-2026-35553?

CVE-2026-35553 is a medium-severity vulnerability in Dynabook Inc. Drfec.sys, classified under Stack-based Buffer Overflow. CVSS score: 6.7/10. Published 2026-04-13.

How severe is CVE-2026-35553?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Buffer overflow in Dynabook Inc. Drfec.sys

CVE-2026-35553

Bluetooth ACPI Drivers provided by Dynabook Inc. contain a stack-based buffer overflow vulnerability. An attacker may execute arbitrary code by modifying certain registry values.

Vulnerability class: Buffer Overflow

Published 2026-04-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (9.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001

Affected products

Dynabook Inc. Drfec.sys — versions v11.0.0.0 and earlier
Dynabook Inc. Tosrfec.sys — versions all versions

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

Frequently asked questions

What is CVE-2026-35553?: CVE-2026-35553 is a medium-severity vulnerability in Dynabook Inc. Drfec.sys, classified under Stack-based Buffer Overflow. CVSS score: 6.7/10. Published 2026-04-13.
How severe is CVE-2026-35553?: Medium severity. CVSS v3 base score is 6.7 out of 10.