CVE-2023-27939

Process-memory disclosure via unchecked image bounds

Published Aug 14, 2023 · Updated Oct 9, 2024

Out-of-bounds read in ImageIO in Apple macOS before 13.3 allows context-dependent attackers to disclose process memory via an image. ImageIO performs an out-of-bounds read because it does not sufficiently validate image input before processing. Exploitation requires a user or application to process a crafted image, and the consequence is limited to disclosure of memory from the affected process.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in ImageIO in Apple macOS before 13.3 allows context-dependent attackers to disclose process memory via an image. ImageIO performs an out-of-bounds read because it does not sufficiently validate image input before processing. Exploitation requires a user or application to process a crafted image, and the consequence is limited to disclosure of memory from the affected process.

The record

CVE
CVE-2023-27939
Published
Aug 14, 2023
Updated
Oct 9, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <13.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <13.3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002Malicious File

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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