What is CVE-2021-33185?

CVE-2021-33185 is a high-severity vulnerability in Serenityos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-06-18.

How severe is CVE-2021-33185?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Serenityos

CVE-2021-33185

SerenityOS contains a buffer overflow in the set_range test in TestBitmap which could allow attackers to obtain sensitive information.

Vulnerability class: Buffer Overflow

Published 2021-06-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Serenityos

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/SerenityOS/serenity/issues/7073 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-33185?: CVE-2021-33185 is a high-severity vulnerability in Serenityos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-06-18.
How severe is CVE-2021-33185?: High severity. CVSS v3 base score is 7.5 out of 10.