What is CVE-2022-21155?

CVE-2022-21155 is a high-severity vulnerability in Apple macOS, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-04-12.

How severe is CVE-2022-21155?

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

Resource exhaustion in Apple macOS

CVE-2022-21155

A specially crafted packet sent to the Fernhill SCADA Server Version 3.77 and earlier may cause an exception, causing the server process (FHSvrService.exe) to exit.

Vulnerability class: DoS (Denial of Service)

Published 2022-04-12 · 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:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Apple macOS
Fernhill Scada Server — versions unspecified
Fernhillsoftware Scada Server
Linux Kernel
Microsoft Windows

Weakness classification (CWE)

References

www.cisa.gov/uscert/ics/advisories/icsa-22-006-02 (US Government Resource, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2022-21155?: CVE-2022-21155 is a high-severity vulnerability in Apple macOS, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-04-12.
How severe is CVE-2022-21155?: High severity. CVSS v3 base score is 7.5 out of 10.