CVE-2020-9843Network attack vector

Cross-site scripting via insufficient input validation

Published Jun 9, 2020 · Updated Aug 4, 2024

Cross-site scripting in Apple Safari before 13.1.1 allows remote attackers to execute script via maliciously crafted web content. An input-validation defect in WebKit processing fails to properly handle attacker-controlled content, allowing injected script to run in the rendered page context. Exploitation requires a victim to load the crafted content, and the documented consequence is cross-site scripting rather than unrestricted native code execution.

CVSS severity7.1
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Apple Safari before 13.1.1 allows remote attackers to execute script via maliciously crafted web content. An input-validation defect in WebKit processing fails to properly handle attacker-controlled content, allowing injected script to run in the rendered page context. Exploitation requires a victim to load the crafted content, and the documented consequence is cross-site scripting rather than unrestricted native code execution.

The record

CVE
CVE-2020-9843
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-79, 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

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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 13.5 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

7.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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