CVE-2021-30862Network attack vector

JavaScript execution via improperly sanitized URL

Published Aug 24, 2021 · Updated Aug 3, 2024

Improper input validation in Apple iTunes U allows remote attackers to execute arbitrary JavaScript when a crafted URL is processed. Apple has not disclosed the URL-processing locus or the specific validation operation that accepted the crafted input. A user must cause the app to process the URL; execution occurs in the app's JavaScript context, with no reported availability impact.

CVSS severity6.1
Medium
EPSS probability1.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Apple iTunes U allows remote attackers to execute arbitrary JavaScript when a crafted URL is processed. Apple has not disclosed the URL-processing locus or the specific validation operation that accepted the crafted input. A user must cause the app to process the URL; execution occurs in the app's JavaScript context, with no reported availability impact.

The record

CVE
CVE-2021-30862
Published
Aug 24, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iTunes U
Classifications
CWE-20
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 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 <3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iTunes Uversion=unspecified <3.8

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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-20Improper Input Validation

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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