CVE-2020-3836

Kernel memory layout disclosure to local users

Published Feb 27, 2020 · Updated Aug 4, 2024

Kernel information disclosure in Apple iOS, macOS, tvOS, and watchOS allows local users to learn kernel layout via a malicious app. Apple identifies an access issue in the Kernel component addressed through improved memory management but does not disclose the faulty code path or operation. Exploitation requires local application execution and reveals layout information, with no reported direct memory read, modification, or code execution.

CVSS severity5.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel information disclosure in Apple iOS, macOS, tvOS, and watchOS allows local users to learn kernel layout via a malicious app. Apple identifies an access issue in the Kernel component addressed through improved memory management but does not disclose the faulty code path or operation. Exploitation requires local application execution and reveals layout information, with no reported direct memory read, modification, or code execution.

The record

CVE
CVE-2020-3836
Published
Feb 27, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
iOS
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <iOS 13.3.1 and iPadOS 13.3.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · iOSversion=unspecified <iOS 13.3.1 and iPadOS 13.3.1
Apple · tvOSversion=unspecified <tvOS 13.3.1
Apple · macOSversion=unspecified <macOS Catalina 10.15.3
Apple · watchOSversion=unspecified <watchOS 6.1.2

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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