CVE-2021-30791

Information disclosure via Model I/O bounds error

Published Sep 8, 2021 · Updated Aug 3, 2024

Out-of-bounds read in Apple Model I/O before iOS 14.7 and macOS 11.5 allows attackers to disclose user information via a crafted file. Model I/O fails to enforce a buffer boundary while parsing the file, causing the parser to read beyond the intended allocation. A user must cause the crafted file to be processed; the documented consequence is information disclosure, with no reported write or execution capability.

CVSS severity5.5
Medium
EPSS probability1.12%
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 Apple Model I/O before iOS 14.7 and macOS 11.5 allows attackers to disclose user information via a crafted file. Model I/O fails to enforce a buffer boundary while parsing the file, causing the parser to read beyond the intended allocation. A user must cause the crafted file to be processed; the documented consequence is information disclosure, with no reported write or execution capability.

The record

CVE
CVE-2021-30791
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-125, CAPEC-540
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 <14.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <14.7
Apple · macOSversion=unspecified <11.5

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers

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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