CVE-2024-5688Public exploitNetwork attack vector

Memory corruption via premature collection during object transplant

Published Jun 11, 2024 · Updated Aug 1, 2024

Use-after-free in Mozilla Firefox before 127, Firefox ESR before 115.12, and Thunderbird before 115.12 allows remote attackers to corrupt memory. During JSObject::swap, setIsUsedAsPrototype can trigger garbage collection before a later pre-write barrier, allowing the referenced object to be swept. Exploitation requires garbage collection at a precise point; Mozilla demonstrates a crash and describes further exploitation as very difficult.

CVSS severity8.1
High
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Mozilla Firefox before 127, Firefox ESR before 115.12, and Thunderbird before 115.12 allows remote attackers to corrupt memory. During JSObject::swap, setIsUsedAsPrototype can trigger garbage collection before a later pre-write barrier, allowing the referenced object to be swept. Exploitation requires garbage collection at a precise point; Mozilla demonstrates a crash and describes further exploitation as very difficult.

The record

CVE
CVE-2024-5688
Published
Jun 11, 2024
Updated
Aug 1, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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=0 <127
  2. Affected versionversion=unspecified <127

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <127; version=unspecified <127
Mozilla · Thunderbirdversion=0 <115.12; version=unspecified <115.12
Mozilla · Firefox ESRversion=0 <115.12; version=unspecified <115.12

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-416Use After Free
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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