What is CVE-2021-36710?

CVE-2021-36710 is a high-severity vulnerability in Toaruos, classified under Exposure of Resource to Wrong Sphere. CVSS score: 8.8/10. Published 2022-06-08.

How severe is CVE-2021-36710?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Toaruos

CVE-2021-36710

ToaruOS 1.99.2 is affected by incorrect access control via the kernel. Improper MMU management and having a low GDT address allows it to be mapped in userland. A call gate can then be written to escalate to CPL 0.

Published 2022-06-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (25.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.5% 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

Toaruos — versions 1.99.2

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

github.com/mehsauce/kowasuos/blob/master/exploits/kowasu-sysfunc-strikes-back.c (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-36710?: CVE-2021-36710 is a high-severity vulnerability in Toaruos, classified under Exposure of Resource to Wrong Sphere. CVSS score: 8.8/10. Published 2022-06-08.
How severe is CVE-2021-36710?: High severity. CVSS v3 base score is 8.8 out of 10.