CVE-2020-3884Network attack vector

Remote JavaScript execution via Mail injection

Published Apr 1, 2020 · Updated Aug 4, 2024

An injection issue in Apple macOS Mail before 10.15.4 allows remote attackers to execute arbitrary JavaScript through crafted email content. Mail fails to validate untrusted message content before passing it to a JavaScript-capable rendering path, enabling script injection. The attacker must cause the message to be processed, and execution is confined to the Mail context rather than establishing kernel or administrator privileges.

CVSS severity6.1
Medium
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An injection issue in Apple macOS Mail before 10.15.4 allows remote attackers to execute arbitrary JavaScript through crafted email content. Mail fails to validate untrusted message content before passing it to a JavaScript-capable rendering path, enabling script injection. The attacker must cause the message to be processed, and execution is confined to the Mail context rather than establishing kernel or administrator privileges.

The record

CVE
CVE-2020-3884
Published
Apr 1, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-74, CWE-20, T1203
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 <macOS Catalina 10.15.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <macOS Catalina 10.15.4

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-20Improper Input Validation
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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