CVE-2020-9934

Name: CVE-2020-9934
Creator: NVD / NIST
Published: 2020-10-16T17:15:17.637+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10Actively ExploitedEPSS 3.21%

Last modified Jun 17, 2026

CVE-2020-9934 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An issue existed in the handling of environment variables. This issue was addressed with improved validation. CISA has confirmed active exploitation in the wild. EPSS estimates a 3.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

3.21%

86.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Sep 29, 2022.

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 13.6
Apple	Iphone Os	< 13.6
Apple	Mac Os X	< 10.15.6

References

https://support.apple.com/HT211288Release Notes, Vendor Advisory
https://support.apple.com/HT211289Release Notes, Vendor Advisory
https://support.apple.com/HT211288Release Notes, Vendor Advisory
https://support.apple.com/HT211289Release Notes, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9934US Government Resource

Timeline

Published: Oct 16, 2020
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2020-9934?

How severe is CVE-2020-9934?

CVE-2020-9934 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 3.21% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2020-9934?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-9934?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST