# CVE-2020-9934: Apple iOS, iPadOS, and macOS Input Validation Vulnerability

> CVE-2020-9934: Apple iOS, iPadOS, and macOS Input Validation Vulnerability. CVSS 5.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-9934
Last updated: 2025-10-21T23:35:35Z

- Published: 2020-10-16 16:51 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: apple
- CVSS: 5.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS: 3.2%, 88th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-09-08, federal due date 2022-09-29, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apple: iOS
- Apple: macOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-9934)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-9934)
- [https://support.apple.com/HT211288](https://support.apple.com/HT211288)
- [https://support.apple.com/HT211289](https://support.apple.com/HT211289)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-9934 · Markdown: https://rewindex.com/cve/CVE-2020-9934.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-9934 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T01:59:19.823Z