CVE-2024-29944Known exploitationPublic exploit

Sandbox escape via SessionStore event-handler injection

Published Mar 22, 2024 · Updated Mar 14, 2025

Sandbox escape in Mozilla Firefox before 124.0.1 and Firefox ESR before 115.9.1 allows attackers to execute JavaScript in the parent process. Session Restore accepts crafted attributes from a compromised content process and installs their event handlers on a privileged parent-process object. Exploitation requires control of a content process; the injected handler escapes the sandbox and runs with browser-parent privileges.

CVSS severity8.4
High
EPSS probability4.70%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in Mozilla Firefox before 124.0.1 and Firefox ESR before 115.9.1 allows attackers to execute JavaScript in the parent process. Session Restore accepts crafted attributes from a compromised content process and installs their event handlers on a privileged parent-process object. Exploitation requires control of a content process; the injected handler escapes the sandbox and runs with browser-parent privileges.

The record

CVE
CVE-2024-29944
Published
Mar 22, 2024
Updated
Mar 14, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-830, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2024Exploitation reportedPwn2Own Vancouver 2024 Firefox sandbox escape demonstration
  2. Mar 22, 2024CVE publishedPublication date reported by the CVE source.
  3. Mar 14, 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 <124.0.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <124; version=unspecified <124.0.1
Mozilla · Firefox ESRversion=0 <115.9.1; version=unspecified <115.9.1

Published CVSS scores

8.4CISA-ADPCVSS:3.1/AV:L/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-830Inclusion of Web Functionality from an Untrusted Source
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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