CVE-2021-30691

Memory disclosure via Model I/O USD parsing

Published Sep 8, 2021 · Updated Aug 3, 2024

Information disclosure in Apple iOS and iPadOS before 14.6 and macOS before 11.4 allows attackers to disclose memory via a malicious USD file. The Model I/O framework performs an out-of-bounds read while parsing crafted Universal Scene Description data, exposing adjacent process memory. Exploitation requires a local user or application to open the file; impact is limited to memory confidentiality, with no integrity or availability effect reported.

CVSS severity5.5
Medium
EPSS probability0.95%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Apple iOS and iPadOS before 14.6 and macOS before 11.4 allows attackers to disclose memory via a malicious USD file. The Model I/O framework performs an out-of-bounds read while parsing crafted Universal Scene Description data, exposing adjacent process memory. Exploitation requires a local user or application to open the file; impact is limited to memory confidentiality, with no integrity or availability effect reported.

The record

CVE
CVE-2021-30691
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1203
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 <14.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <14.6
Apple · macOSversion=unspecified <11.4; version=unspecified <2021

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.3NVDAV:N/AC:M/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

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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