CVE-2024-7652Network attack vector

Application crash via reentrant Async Generator return

Published Sep 6, 2024 · Updated Oct 30, 2025

Type confusion in Mozilla Firefox before 128, Firefox ESR before 115.13, and Thunderbird before 128 allows remote attackers to crash the application. A reentrant AsyncGenerator.prototype.return call can change the generator state while AsyncGeneratorAwaitReturn drains its queue, violating the completed-state assumption and causing an incompatible object access. Triggering requires crafted JavaScript that installs a then getter and reenters return during promise resolution; Mozilla reports memory corruption and an exploitable crash.

CVSS severity7.5
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Mozilla Firefox before 128, Firefox ESR before 115.13, and Thunderbird before 128 allows remote attackers to crash the application. A reentrant AsyncGenerator.prototype.return call can change the generator state while AsyncGeneratorAwaitReturn drains its queue, violating the completed-state assumption and causing an incompatible object access. Triggering requires crafted JavaScript that installs a then getter and reenters return during promise resolution; Mozilla reports memory corruption and an exploitable crash.

The record

CVE
CVE-2024-7652
Published
Sep 6, 2024
Updated
Oct 30, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-476, CWE-843, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 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=0 <128
  2. Affected versionversion=unspecified <128

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <128; version=unspecified <128
Mozilla · Thunderbirdversion=0 <115.13; version=0 <128; version=unspecified <115.13; version=unspecified <128
Mozilla · Firefox ESRversion=0 <115.13; version=unspecified <115.13

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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