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MEDIUM · CVSS 5.5 CISA Known Exploited Vulnerability

CVE-2020-9934

Apple iOS, iPadOS, and macOS Input Validation Vulnerability

Apple iOS, iPadOS, and macOS

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.

CVSS
5.5
MEDIUM
EPSS
3.2%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
16 Oct 2020
NVD

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 8 September 2022. US federal agencies were required to remediate it by 29 September 2022.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 3.2%, which is higher than 88.1% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2020-9934 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2020-9934.

What does CVE-2020-9934 affect?

CVE-2020-9934 affects Apple iOS, iPadOS, and macOS. 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.

How severe is CVE-2020-9934?

CVE-2020-9934 is rated MEDIUM with a CVSS base score of 5.5. EPSS puts the probability of exploitation in the next 30 days at 3.2%, higher than 88.1% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 29 September 2022.

How should organisations respond to CVE-2020-9934?

Apply the vendor patch for Apple iOS, iPadOS, and macOS as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.