CVE-2024-8381Network attack vector

Memory corruption via with-environment property lookup

Published Sep 3, 2024 · Updated Nov 4, 2025

Type confusion in affected Firefox, Firefox ESR, and Thunderbird releases allows remote attackers to corrupt memory through crafted JavaScript. A property-name lookup on an object serving as a JavaScript with environment confuses the object's runtime type, creating an exploitable memory-safety condition. Firefox exposure requires script execution in a browsing context; Thunderbird disables scripting while reading email, limiting ordinary message-based reachability.

CVSS severity9.8
Critical
EPSS probability4.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in affected Firefox, Firefox ESR, and Thunderbird releases allows remote attackers to corrupt memory through crafted JavaScript. A property-name lookup on an object serving as a JavaScript with environment confuses the object's runtime type, creating an exploitable memory-safety condition. Firefox exposure requires script execution in a browsing context; Thunderbird disables scripting while reading email, limiting ordinary message-based reachability.

The record

CVE
CVE-2024-8381
Published
Sep 3, 2024
Updated
Nov 4, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-843, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=0 <130
  2. Affected versionversion=unspecified <130

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <130; version=unspecified <130
Mozilla · Thunderbirdversion=unspecified <115.15; version=unspecified <128.2
Mozilla · Firefox ESRversion=0 <115.15; version=0 <128.2; version=unspecified <115.15; version=unspecified <128.2

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-843Access of Resource Using Incompatible Type ('Type Confusion')
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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