How severe is CVE-2021-36710?

CVE-2021-36710 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-36710 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36710?

CVE-2021-36710 affects Toaruos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36710?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-36710 published?

CVE-2021-36710 was published on 2022-06-08 and last updated on 2026-06-17.

CVE-2021-36710

CVE-2021-36710 is a high-severity vulnerability in Toaruos with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-668.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-668
Affected product: Toaruos
Published: 2022-06-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-36710?: CVE-2021-36710 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-36710 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36710?: CVE-2021-36710 affects Toaruos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36710?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-36710 published?: CVE-2021-36710 was published on 2022-06-08 and last updated on 2026-06-17.

References

https://github.com/mehsauce/kowasuos/blob/master/exploits/kowasu-sysfunc-strikes-back.c

Affected products (1)

cpe:2.3:o:toaruos:toaruos:1.99.2:*:*:*:*:*:*:*

More vulnerabilities in Toaruos

CVE-2022-38932 — High (CVSS 7.8): readelf in ToaruOS 2.0.1 has a global overflow allowing RCE when parsing a crafted ELF file.
CVE-2022-38934 — Low (CVSS 3.3): readelf in ToaruOS 2.0.1 has some arbitrary address read vulnerabilities when parsing a crafted ELF file.

All CVEs affecting Toaruos →

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