What is CVE-2021-27203?

CVE-2021-27203 is a medium-severity vulnerability in Dekart Private Disk, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2021-02-16.

How severe is CVE-2021-27203?

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

NULL pointer dereference in Dekart Private Disk

CVE-2021-27203

In Dekart Private Disk 2.15, invalid use of the Type3 user buffer for IOCTL codes using METHOD_NEITHER results in arbitrary memory dereferencing.

Published 2021-02-16 · 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: 0.004 (29.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Dekart Private Disk — versions 2.15

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

www.dekart.com/products/encryption/private_disk (Product, Vendor Advisory)
www.rootshellsecurity.net/rootshell-discover-denial-of-service-flaw-dekart-priv… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27203?: CVE-2021-27203 is a medium-severity vulnerability in Dekart Private Disk, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2021-02-16.
How severe is CVE-2021-27203?: Medium severity. CVSS v3 base score is 5.5 out of 10.