CVE-2024-6613Public exploit

Incorrect stack traces via repeated Wasm frames

Published Jul 9, 2024 · Updated Oct 30, 2025

Incorrect stack-frame iteration in Mozilla Firefox and Thunderbird before 128 allows attackers to produce wrong traces via crafted Wasm. JSJitFrameIter wrongly applies bailout data to JSJitToWasm transition frames, restarting at the bailout frame instead of advancing to the next JavaScript frame. Execution requires Wasm-to-JavaScript calls, promises, saved stacks, and an exception during bailout; release builds cap the duplicated trace at 128 frames.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect stack-frame iteration in Mozilla Firefox and Thunderbird before 128 allows attackers to produce wrong traces via crafted Wasm. JSJitFrameIter wrongly applies bailout data to JSJitToWasm transition frames, restarting at the bailout frame instead of advancing to the next JavaScript frame. Execution requires Wasm-to-JavaScript calls, promises, saved stacks, and an exception during bailout; release builds cap the duplicated trace at 128 frames.

The record

CVE
CVE-2024-6613
Published
Jul 9, 2024
Updated
Oct 30, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-209
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 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=unspecified <128

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <128
Mozilla · Thunderbirdversion=unspecified <128

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information

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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