CVE-2024-2607Public exploitNetwork attack vector

Code execution via unsaved JIT return registers

Published Mar 19, 2024 · Updated Feb 13, 2025

Code execution in Mozilla Firefox before 124, Firefox ESR before 115.9, and Thunderbird before 115.9 allows remote attackers to run arbitrary code. The Arm JIT flexibleDivMod32 path fails to preserve output return registers across a call from JIT code to C++, allowing their values to be overwritten. Exploitation is limited to Armv7-A processors without the optional sdiv instruction; Thunderbird mail reading disables scripting, so browser-like content is required there.

CVSS severity8.1
High
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code execution in Mozilla Firefox before 124, Firefox ESR before 115.9, and Thunderbird before 115.9 allows remote attackers to run arbitrary code. The Arm JIT flexibleDivMod32 path fails to preserve output return registers across a call from JIT code to C++, allowing their values to be overwritten. Exploitation is limited to Armv7-A processors without the optional sdiv instruction; Thunderbird mail reading disables scripting, so browser-like content is required there.

The record

CVE
CVE-2024-2607
Published
Mar 19, 2024
Updated
Feb 13, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-123, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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 <124
  2. Affected versionversion=unspecified <124

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <124; version=unspecified <124
Mozilla · Thunderbirdversion=0 <115.9; version=unspecified <115.9
Mozilla · Firefox ESRversion=0 <115.9; version=unspecified <115.9

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:H/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 exploitPublished

Weakness, pattern, technique

CWE-123Write-what-where Condition
T1203Exploitation for Client Execution

Public exploit references

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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