CVE-2021-30848

Code execution via WebKit memory corruption

Published Oct 19, 2021 · Updated Aug 3, 2024

Memory corruption in Apple WebKit before iOS 14.8, iPadOS 14.8, or Safari 15 allows attackers to execute code via crafted web content. WebKit mishandles memory while processing untrusted web content, corrupting memory instead of safely rejecting the input; Apple has not disclosed a more specific code locus or operation. An attacker must induce WebKit to process the content, and successful exploitation executes code in the affected process context.

CVSS severity7.8
High
EPSS probability1.27%
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 Apple WebKit before iOS 14.8, iPadOS 14.8, or Safari 15 allows attackers to execute code via crafted web content. WebKit mishandles memory while processing untrusted web content, corrupting memory instead of safely rejecting the input; Apple has not disclosed a more specific code locus or operation. An attacker must induce WebKit to process the content, and successful exploitation executes code in the affected process context.

The record

CVE
CVE-2021-30848
Published
Oct 19, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
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 <14.8
  2. Affected versionversion=unspecified <15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <14.8; version=unspecified <15
Apple · Safariversion=unspecified <15

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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