CVE-2024-2606Public exploitNetwork attack vector

WebAssembly value corruption via register misallocation

Published Mar 19, 2024 · Updated Oct 30, 2024

Incorrect type conversion in Firefox before 124 allows remote attackers to corrupt WebAssembly values through crafted module code. During a br_on_cast branch with extra block parameters, the baseline compiler can spill assigned register parameters to the stack and continue with stale allocation state that treats arbitrary integers as pointers. The path requires WebAssembly GC, enabled from Firefox 120; the public debug-shell proof triggers a crash, while the published assessment establishes low-integrity modification rather than code execution.

CVSS severity3.7
Low
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect type conversion in Firefox before 124 allows remote attackers to corrupt WebAssembly values through crafted module code. During a br_on_cast branch with extra block parameters, the baseline compiler can spill assigned register parameters to the stack and continue with stale allocation state that treats arbitrary integers as pointers. The path requires WebAssembly GC, enabled from Firefox 120; the public debug-shell proof triggers a crash, while the published assessment establishes low-integrity modification rather than code execution.

The record

CVE
CVE-2024-2606
Published
Mar 19, 2024
Updated
Oct 30, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-704
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record 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=unspecified <124

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <124

Published CVSS scores

3.7CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-704Incorrect Type Conversion or Cast

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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