CVE-2020-22886Public exploitNetwork attack vector

Service crash via recursive garbage-collector marking

Published Jul 13, 2021 · Updated Aug 4, 2024

Stack overflow in MuJS before 1.0.8 allows remote attackers to crash an embedding application by supplying crafted JavaScript. The crafted script creates an object graph that the garbage collector traverses recursively between jsG_markproperty and jsG_markobject until the process stack is exhausted. Exposure requires an embedding application to evaluate attacker-controlled JavaScript; the demonstrated consequence is process termination, not data access or code execution.

CVSS severity7.5
High
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in MuJS before 1.0.8 allows remote attackers to crash an embedding application by supplying crafted JavaScript. The crafted script creates an object graph that the garbage collector traverses recursively between jsG_markproperty and jsG_markobject until the process stack is exhausted. Exposure requires an embedding application to evaluate attacker-controlled JavaScript; the demonstrated consequence is process termination, not data access or code execution.

The record

CVE
CVE-2020-22886
Published
Jul 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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