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CVE-2020-9934

Medium CVSS 5.5 Known exploited

Published 2020-10-16 · last changed 2026-06-17 · added to CISA KEV 2022-09-08

This one is being exploited in the wild.

CISA added CVE-2020-9934 to the Known Exploited Vulnerabilities catalog on 2022-09-08. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2020-9934, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

An issue existed in the handling of environment variables. This issue was addressed with improved validation. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6. A local user may be able to view sensitive user information.

Sources

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N