CVE-2021-46490Public exploit

Denial of service via NumberConstructor SEGV

Published Jan 27, 2022 · Updated Aug 4, 2024

A denial-of-service flaw in NumberConstructor in Jsish 3.5.0 allows local users to interrupt the interpreter via crafted JavaScript. Number.bind with supplied arguments reaches NumberConstructor, which reads a null pointer at src/jsiNumber.c:93 and triggers a segmentation fault. The trigger requires execution of attacker-controlled script and affects availability only; no data disclosure or modification is reported.

CVSS severity5.5
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A denial-of-service flaw in NumberConstructor in Jsish 3.5.0 allows local users to interrupt the interpreter via crafted JavaScript. Number.bind with supplied arguments reaches NumberConstructor, which reads a null pointer at src/jsiNumber.c:93 and triggers a segmentation fault. The trigger requires execution of attacker-controlled script and affects availability only; no data disclosure or modification is reported.

The record

CVE
CVE-2021-46490
Published
Jan 27, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

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
4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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

T1499Endpoint Denial of Service

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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