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CVE Record

CVE-2020-9934: An issue existed in the handling of environment variables.

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.

MediumCVSS 5.5Known exploitedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This Apple issue could let someone with local access to a vulnerable device view sensitive user information because environment variables were not validated correctly. Apple fixed it in iOS 13.6, iPadOS 13.6, and macOS Catalina 10.15.6. CISA lists it in KEV, so treat legacy unpatched Apple endpoints as urgent.

Executive priority

Prioritize remediation for unmanaged or legacy Apple devices because this CVE is in CISA KEV. The vulnerability is not remotely exploitable based on the supplied CVSS vector, but successful local abuse could expose sensitive user information.

Technical view

CVE-2020-9934 is a local information disclosure flaw in Apple environment variable handling. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, reflecting high confidentiality impact but requiring local low-privileged access. Apple says improved validation addressed the issue.

Likely exposure

Exposure is most likely on older Apple endpoints that have not reached iOS 13.6, iPadOS 13.6, or macOS Catalina 10.15.6. The source bundle does not identify exact vulnerable builds beyond unspecified iOS and macOS versions and the fixed releases.

Exploitation context

CISA KEV inclusion supports known exploitation. The provided sources do not describe exploitation volume, targets, exploit chain details, or whether exploitation remains current. Because exploitation requires local access, business risk is highest where attackers can obtain low-privileged device access.

Researcher notes

Key unknowns remain: exact affected version ranges, affected component name, exploit chain context, and observable indicators are not provided in the bundle. Validation should focus on version state and device management evidence, not exploit reproduction.

Mitigation direction

  • Update iOS devices to iOS 13.6 or later.
  • Update iPadOS devices to iPadOS 13.6 or later.
  • Update macOS Catalina systems to 10.15.6 or later.
  • Use MDM reporting to find older Apple endpoints.
  • Check Apple security guidance for any platform-specific updates.

Validation and detection

  • Inventory Apple endpoints and record OS versions.
  • Flag iOS or iPadOS devices below 13.6.
  • Flag macOS Catalina systems below 10.15.6.
  • Confirm update status through MDM or endpoint management.
  • Review whether legacy devices still permit local user access.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-9934 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
Yes
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CISA KEV status

Status
Known exploited
Source
CISA / ADP
Date added
Not provided

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2020-9934Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
AppleiOSunspecifiedListed
ApplemacOSunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.