CVE-2021-30849

Arbitrary code execution via WebKit memory corruption

Published Oct 19, 2021 · Updated Aug 3, 2024

Memory corruption in WebKit in affected Apple products allows attackers to execute arbitrary code by processing malicious web content. Apple discloses multiple memory-corruption issues in WebKit's handling of attacker-controlled web content but does not identify the affected functions or faulty operations. Execution requires a user or application to process the crafted content, and the resulting code runs in the context of the affected WebKit-based process.

CVSS severity7.8
High
EPSS probability1.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in WebKit in affected Apple products allows attackers to execute arbitrary code by processing malicious web content. Apple discloses multiple memory-corruption issues in WebKit's handling of attacker-controlled web content but does not identify the affected functions or faulty operations. Execution requires a user or application to process the crafted content, and the resulting code runs in the context of the affected WebKit-based process.

The record

CVE
CVE-2021-30849
Published
Oct 19, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iTunes for Windows
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 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 <12.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iTunes for Windowsversion=unspecified <12.12
Apple · iOS and iPadOSversion=unspecified <14.8; version=unspecified <15
Apple · Safariversion=unspecified <15
Apple · tvOSversion=unspecified <15
Apple · watchOSversion=unspecified <8

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-787Out-of-bounds Write
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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