CVE-2020-23258Public exploitNetwork attack vector

Interpreter crash via unchecked null-pointer dereference

Published Apr 4, 2023 · Updated Feb 13, 2025

Null-pointer dereference in Jsish 3.0.11 allows remote attackers to crash the interpreter through a crafted JavaScript file. The isFinite callback reached through Array.find passes a null value pointer to Jsi_ValueIsNumber, which dereferences pv->vt without checking the pointer and triggers a segmentation fault. Exploitation requires execution of attacker-controlled JavaScript; the demonstrated consequence is process termination, with no reported confidentiality or integrity impact.

CVSS severity7.5
High
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null-pointer dereference in Jsish 3.0.11 allows remote attackers to crash the interpreter through a crafted JavaScript file. The isFinite callback reached through Array.find passes a null value pointer to Jsi_ValueIsNumber, which dereferences pv->vt without checking the pointer and triggers a segmentation fault. Exploitation requires execution of attacker-controlled JavaScript; the demonstrated consequence is process termination, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2020-23258
Published
Apr 4, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation Flaws

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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