CVE-2020-22882Public exploitNetwork attack vector

Unauthenticated compiler crash via missing expression node

Published Jul 13, 2021 · Updated Aug 4, 2024

Type confusion in the Moddable XS JavaScript parser before OS200831 allows remote attackers to crash the compiler with crafted code. When an empty array subscript appears in an assignment, fxParserTree leaves no expression node, and later code treats that missing node as a temporary function node. Unauthenticated submission of JavaScript for compilation is required, and successful exploitation interrupts the affected XS compiler process without reported data access or modification.

CVSS severity7.5
High
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in the Moddable XS JavaScript parser before OS200831 allows remote attackers to crash the compiler with crafted code. When an empty array subscript appears in an assignment, fxParserTree leaves no expression node, and later code treats that missing node as a temporary function node. Unauthenticated submission of JavaScript for compilation is required, and successful exploitation interrupts the affected XS compiler process without reported data access or modification.

The record

CVE
CVE-2020-22882
Published
Jul 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-843, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2021CVE 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 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
5.0NIST NVDAV:N/AC:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499.004Endpoint Denial of Service: Application 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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