CVE-2024-1552Public exploitNetwork attack vector

Undefined behavior via incorrect float register transfer

Published Feb 20, 2024 · Updated Mar 27, 2025

Incorrect numeric conversion in Mozilla Firefox before 123, Firefox ESR before 115.8, and Thunderbird before 115.8 allows undefined behavior. On 32-bit ARM, the JavaScript engine moveValue path passes a Float32 scratch register where convertFloat32ToDouble requires a double register, then transfers stale s30/s31 contents into a JS value. Crafted JavaScript can reach the faulty JIT path and crash a debug build; Mozilla assessed controlled type confusion as unlikely because the necessary NaN payload is difficult to create.

CVSS severity7.5
High
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect numeric conversion in Mozilla Firefox before 123, Firefox ESR before 115.8, and Thunderbird before 115.8 allows undefined behavior. On 32-bit ARM, the JavaScript engine moveValue path passes a Float32 scratch register where convertFloat32ToDouble requires a double register, then transfers stale s30/s31 contents into a JS value. Crafted JavaScript can reach the faulty JIT path and crash a debug build; Mozilla assessed controlled type confusion as unlikely because the necessary NaN payload is difficult to create.

The record

CVE
CVE-2024-1552
Published
Feb 20, 2024
Updated
Mar 27, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-681
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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 <123

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <123
Mozilla · Thunderbirdversion=unspecified <115.8
Mozilla · Firefox ESRversion=unspecified <115.8

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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-681Incorrect Conversion between Numeric Types

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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