CVE-2020-3910Network attack vector

Memory corruption via unchecked libxml2 input size

Published Apr 1, 2020 · Updated Aug 4, 2024

A libxml2 buffer overflow in affected Apple platforms and Windows clients allows attackers to corrupt memory through oversized input. Apple states that improved size validation corrected the flaw but does not identify the libxml2 function, field, or parsing operation that accepts the untrusted size. The disclosure does not specify how input reaches the component or whether corruption yields a crash, data access, or code execution.

CVSS severity9.8
Critical
EPSS probability1.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A libxml2 buffer overflow in affected Apple platforms and Windows clients allows attackers to corrupt memory through oversized input. Apple states that improved size validation corrected the flaw but does not identify the libxml2 function, field, or parsing operation that accepts the untrusted size. The disclosure does not specify how input reaches the component or whether corruption yields a crash, data access, or code execution.

The record

CVE
CVE-2020-3910
Published
Apr 1, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 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

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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 <iOS 13.4 and iPadOS 13.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <iOS 13.4 and iPadOS 13.4
Apple · iTunes for Windowsversion=unspecified <iTunes for Windows 12.10.5
Apple · iCloud for Windows (Legacy)version=unspecified <iCloud for Windows 7.18
Apple · iCloud for Windowsversion=unspecified <iCloud for Windows 10.9.3
Apple · tvOSversion=unspecified <tvOS 13.4
Apple · macOSversion=unspecified <macOS Catalina 10.15.4
Apple · watchOSversion=unspecified <watchOS 6.2

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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