CVE-2024-11699Network attack vector

Arbitrary code execution via memory corruption

Published Nov 26, 2024 · Updated Nov 3, 2025

Memory-safety defects in Mozilla Firefox before 133, Firefox ESR before 128.5, and Thunderbird before 133 allow remote attackers to execute code. Mozilla identifies the locus only as multiple memory-safety bugs; public advisories do not disclose the affected functions or faulty operations. Exploitation requires user interaction with attacker-controlled web content; Thunderbird mail reading disables scripting, limiting exposure to browser-like contexts.

CVSS severity8.8
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-safety defects in Mozilla Firefox before 133, Firefox ESR before 128.5, and Thunderbird before 133 allow remote attackers to execute code. Mozilla identifies the locus only as multiple memory-safety bugs; public advisories do not disclose the affected functions or faulty operations. Exploitation requires user interaction with attacker-controlled web content; Thunderbird mail reading disables scripting, limiting exposure to browser-like contexts.

The record

CVE
CVE-2024-11699
Published
Nov 26, 2024
Updated
Nov 3, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 26, 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

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 <133
  2. Affected versionversion=unspecified <133

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <133; version=unspecified <133
Mozilla · Thunderbirdversion=0 <128.5; version=0 <133; version=unspecified <128.5; version=unspecified <133
Mozilla · Firefox ESRversion=0 <128.5; version=unspecified <128.5

Published CVSS scores

8.8SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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