ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2020-9934

Apple iOS, iPadOS, and macOS Input Validation Vulnerability

Published Oct 16, 2020 · catalog updated Jun 16, 2026 · Apple iOS, iPadOS, and macOS

Patch now

CVE-2020-9934 is in the CISA known-exploited catalog, due Sep 29, 2022. Confirm Apple iOS, iPadOS, and macOS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Medium5.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
3.21%
Remediation
Remediation guidance
Affected products
cpe apple/ipados · cpe apple/iphone os · cpe apple/mac os x · vendor 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apple/ipadosversion unspecified
  • cpe apple/iphone osversion unspecified
  • cpe apple/mac os xversion unspecified
  • vendor Apple iOS, iPadOS, and macOSversion unspecified

How to fix CVE-2020-9934

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-9934 is in the CISA known-exploited catalog, due Sep 29, 2022. Confirm Apple iOS, iPadOS, and macOS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

No weakness class is stored. EPSS 3.21%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 16, 2020 · Catalog

    Detected

    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.

  2. Sep 8, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Sep 29, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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

  • CISA KEVConfirmed exploitationCVE-2020-9934

    Apple iOS, iPadOS, and macOS contain an unspecified vulnerability involving input validation which can allow a local attacker to view sensitive user information.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-9934

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-9934

    30-day exploitation probability 3.2%

    first.org
  • Metasploit ModulesPublic exploit modulepost_osx/escalate/tccbypass

    Public module reference (normal). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2020-9934

    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.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2020-9934

    Apple iOS, iPadOS, and macOS contain an unspecified vulnerability involving input validation which can allow a local attacker to view sensitive user information.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.