CVE-2020-23260Public exploitNetwork attack vector

Interpreter crash via invalid callback dereference

Published Apr 4, 2023 · Updated Feb 18, 2025

Invalid memory access in StringReplaceCmd in Jsish 3.0.11 and earlier allows attackers to crash the interpreter via crafted JavaScript. StringReplaceCmd treats the built-in isFinite callback like an interpreted function and dereferences its missing argument-name structure. The demonstrated trigger requires execution of attacker-supplied JavaScript that invokes String.replace with a built-in callback; the observed consequence is a process crash.

CVSS severity7.5
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid memory access in StringReplaceCmd in Jsish 3.0.11 and earlier allows attackers to crash the interpreter via crafted JavaScript. StringReplaceCmd treats the built-in isFinite callback like an interpreted function and dereferences its missing argument-name structure. The demonstrated trigger requires execution of attacker-supplied JavaScript that invokes String.replace with a built-in callback; the observed consequence is a process crash.

The record

CVE
CVE-2020-23260
Published
Apr 4, 2023
Updated
Feb 18, 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 18, 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

7.5NIST NVDCVSS: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.

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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

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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