CVE-2024-2613Network attack vector

Crash via unbounded QUIC ACK allocation

Published Mar 19, 2024 · Updated Aug 2, 2024

Improper input validation in Firefox before 124 allows remote attackers to crash the browser through a tampered QUIC ACK frame. The Neqo frame decoder reads the attacker-controlled ACK range count and passes it to Vec::with_capacity without enforcing an upper bound. A malicious QUIC server must return the crafted frame to a connecting browser, causing memory exhaustion and a process crash.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Firefox before 124 allows remote attackers to crash the browser through a tampered QUIC ACK frame. The Neqo frame decoder reads the attacker-controlled ACK range count and passes it to Vec::with_capacity without enforcing an upper bound. A malicious QUIC server must return the crafted frame to a connecting browser, causing memory exhaustion and a process crash.

The record

CVE
CVE-2024-2613
Published
Mar 19, 2024
Updated
Aug 2, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1021, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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 <124
  2. Affected versionversion=unspecified <124

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <124; version=unspecified <124

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NISTCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames
T1499.004Application or System Exploitation

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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