CVE-2024-9401Network attack vector

Code execution via undisclosed memory corruption

Published Oct 1, 2024 · Updated Nov 3, 2025

Memory corruption in Firefox before 131, Firefox ESR before 115.16 or 128.3, and Thunderbird before 128.3 or 131 allows attackers to run code. Mozilla groups four memory-safety defects under this identifier; some corrupt memory, but their code loci, triggering inputs, and faulty operations are undisclosed. The triggering vector is undisclosed; Thunderbird disables scripting while reading email, so ordinary message viewing does not expose the browser-like context.

CVSS severity9.8
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Firefox before 131, Firefox ESR before 115.16 or 128.3, and Thunderbird before 128.3 or 131 allows attackers to run code. Mozilla groups four memory-safety defects under this identifier; some corrupt memory, but their code loci, triggering inputs, and faulty operations are undisclosed. The triggering vector is undisclosed; Thunderbird disables scripting while reading email, so ordinary message viewing does not expose the browser-like context.

The record

CVE
CVE-2024-9401
Published
Oct 1, 2024
Updated
Nov 3, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-119, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=0 <131
  2. Affected versionversion=unspecified <131

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <131; version=unspecified <131
Mozilla · Thunderbirdversion=0 <128.3; version=0 <131; version=unspecified <128.3; version=unspecified <131
Mozilla · Firefox ESRversion=0 <115.16; version=0 <128.3; version=unspecified <115.16; version=unspecified <128.3

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5Oracle LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:R/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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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