CVE-2023-31921Public exploit

Application crash via crafted BigInt division

Published May 12, 2023 · Updated Jan 24, 2025

Reachable assertion in JerryScript 3.0 allows local users to crash an application through crafted BigInt division JavaScript. BigInt exponentiation followed by division reaches a dividend-limb invariant in ecma_big_uint_div_mod, causing JERRY_FATAL_FAILED_ASSERTION and abort. The published reproduction uses a 32-bit debug build and requires execution of attacker-supplied JavaScript; the demonstrated consequence is process termination.

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

What happened

Reachable assertion in JerryScript 3.0 allows local users to crash an application through crafted BigInt division JavaScript. BigInt exponentiation followed by division reaches a dividend-limb invariant in ecma_big_uint_div_mod, causing JERRY_FATAL_FAILED_ASSERTION and abort. The published reproduction uses a 32-bit debug build and requires execution of attacker-supplied JavaScript; the demonstrated consequence is process termination.

The record

CVE
CVE-2023-31921
Published
May 12, 2023
Updated
Jan 24, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 24, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDCVSS: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-617Reachable Assertion
T1499.004Application or System Exploitation

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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