CVE-2021-30788

Service interruption and memory disclosure via crafted TIFF

Published Sep 8, 2021 · Updated Aug 3, 2024

Improper checking in FontParser on affected Apple operating systems allows attackers to disclose memory or interrupt service via a crafted TIFF file. Apple has not published which FontParser check mishandles TIFF data or the specific memory-safety error involved. Exploitation requires a user or application to process the file; successful cases can interrupt FontParser-dependent processing or disclose memory contents.

CVSS severity7.1
High
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper checking in FontParser on affected Apple operating systems allows attackers to disclose memory or interrupt service via a crafted TIFF file. Apple has not published which FontParser check mishandles TIFF data or the specific memory-safety error involved. Exploitation requires a user or application to process the file; successful cases can interrupt FontParser-dependent processing or disclose memory contents.

The record

CVE
CVE-2021-30788
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS
Classifications
T1204.002
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?

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  1. Affected versionversion=unspecified <14.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <14.7
Apple · Security Update Catalinaversion=unspecified <2021
Apple · macOSversion=unspecified <11.5; version=unspecified <14.7; version=unspecified <2021; version=unspecified <7.6

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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