What is CVE-2021-33598?

CVE-2021-33598 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.6/10. Published 2021-08-23.

How severe is CVE-2021-33598?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Vulnerability in Apple macOS

CVE-2021-33598

A Denial-of-Service (DoS) vulnerability was discovered in all versions of F-Secure Atlant whereby the SAVAPI component used in certain F-Secure products can crash while scanning fuzzed files. The exploit can be triggered remotely by an attacker. A successful attack will result in Denial-of-Service (DoS) of the Anti-Virus engine.

Published 2021-08-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (54.5th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

References

www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame (Vendor Advisory)
www.f-secure.com/en/business/support-and-downloads/security-advisories (Vendor Advisory)
www.f-secure.com/en/business/support-and-downloads/security-advisories/fsc-2021… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-33598?: CVE-2021-33598 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.6/10. Published 2021-08-23.
How severe is CVE-2021-33598?: Medium severity. CVSS v3 base score is 4.6 out of 10.