CVE-2020-9803Network attack vector

Arbitrary code execution via WebKit memory corruption

Published Jun 9, 2020 · Updated Aug 4, 2024

Memory corruption in WebKit in affected Apple products allows remote attackers to execute arbitrary code via crafted web content. Apple has not disclosed the affected WebKit code locus or the validation error that corrupts memory while processing untrusted web content. Exploitation requires a user to process attacker-controlled web content and can compromise the affected application's execution context.

CVSS severity8.8
High
EPSS probability1.79%
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 remote attackers to execute arbitrary code via crafted web content. Apple has not disclosed the affected WebKit code locus or the validation error that corrupts memory while processing untrusted web content. Exploitation requires a user to process attacker-controlled web content and can compromise the affected application's execution context.

The record

CVE
CVE-2020-9803
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-20, CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <iOS 13.5 and iPadOS 13.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <iOS 13.5 and iPadOS 13.5
Apple · iTunes for Windowsversion=unspecified <iTunes 12.10.7 for Windows
Apple · Safariversion=unspecified <Safari 13.1.1
Apple · iCloud for Windows (Legacy)version=unspecified <iCloud for Windows 7.19
Apple · iCloud for Windowsversion=unspecified <iCloud for Windows 11.2
Apple · tvOSversion=unspecified <tvOS 13.4.5
Apple · watchOSversion=unspecified <watchOS 6.2.5

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-20Improper Input Validation
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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