CVE-2020-9934
MediumExploitedPublic exploitAn issue existed in the handling of environment variables.
Published Oct 16, 2020 · Updated Oct 23, 2025
Key Facts
Patch immediately- CVE-2020-9934 is a medium-severity vulnerability (CVSS 5.5 v3.1) affecting Ipados (Apple), Iphone OS (Apple), Mac OS X (Apple) and 2 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 19, 2022. Public exploit code is available.
- EPSS estimates a 3.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 13.6, Iphone OS 13.6, Mac OS X 10.15.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
3.2%
Higher than 87.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2020-9934 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 8, 2022 | Sep 29, 2022 | Not reported |
| Industry KEV feed | Jul 19, 2022 | Sep 29, 2022 | Not reported |
| CIRCL KEV | Sep 8, 2022 | Sep 29, 2022 | Not reported |
| ENISA EUVD | Sep 8, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 13.6 |
| Iphone OSApple | See advisory | 13.6 |
| Mac OS XApple | See advisory | 10.15.6 |
| iOS | >= unspecified | iOS 13.6 and iPadOS 13.6 |
| macOS | >= unspecified | macOS Catalina 10.15.6 |
Patched Releases
Ipados
13.6
Iphone OS
13.6
Mac OS X
10.15.6
iOS
iOS 13.6 and iPadOS 13.6
macOS
macOS Catalina 10.15.6
Timeline
Publicly disclosed
Oct 16, 2020
Added to Industry KEV feed
Jul 19, 2022
Added to CISA KEV
Sep 8, 2022
Added to CIRCL KEV
Sep 8, 2022
Added to ENISA EUVD
Sep 8, 2022
Last updated
Oct 23, 2025
References
FAQ
Common Questions.
An issue existed in the handling of environment variables.
Affected: Ipados (Apple); Iphone OS (Apple); Mac OS X (Apple), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 19, 2022.
Yes. It was added on Sep 8, 2022 with a federal remediation due date of Sep 29, 2022.
Public exploit code is available.
Fixed versions are available, including Ipados 13.6, Iphone OS 13.6, Mac OS X 10.15.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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