CVE-2021-30911

Memory disclosure via out-of-bounds USD parsing

Published Aug 24, 2021 · Updated Aug 3, 2024

An out-of-bounds read in Model I/O in Apple iOS, iPadOS, and macOS allows attackers to disclose memory via a crafted USD file. Model I/O processes attacker-controlled USD data without sufficient bounds checking, causing a read beyond the intended buffer. Exploitation requires a user or application to process the file; disclosed memory can expose data from the affected process.

CVSS severity5.5
Medium
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in Model I/O in Apple iOS, iPadOS, and macOS allows attackers to disclose memory via a crafted USD file. Model I/O processes attacker-controlled USD data without sufficient bounds checking, causing a read beyond the intended buffer. Exploitation requires a user or application to process the file; disclosed memory can expose data from the affected process.

The record

CVE
CVE-2021-30911
Published
Aug 24, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 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 <15.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <15.1
Apple · macOSversion=unspecified <11.6; version=unspecified <12.0; version=unspecified <2021

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
5.5NVDCVSS: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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