CVE-2020-28496Public exploitNetwork attack vector

Service interruption via color-parser regular expressions

Published Feb 18, 2021 · Updated Sep 17, 2024

Regular expression denial of service in Three.js before 0.125.0 allows remote attackers to interrupt service via crafted CSS color strings. Color.setStyle extracts rgb or hsl components, strips unbounded leading whitespace with a separate regular expression, then applies anchored numeric parsers, causing excessive processing on a long whitespace-only component. An application must pass attacker-controlled style strings to the Color parser; exploitation consumes CPU and can make the hosting process unresponsive.

CVSS severity7.5
High
EPSS probability2.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in Three.js before 0.125.0 allows remote attackers to interrupt service via crafted CSS color strings. Color.setStyle extracts rgb or hsl components, strips unbounded leading whitespace with a separate regular expression, then applies anchored numeric parsers, causing excessive processing on a long whitespace-only component. An application must pass attacker-controlled style strings to the Color parser; exploitation consumes CPU and can make the hosting process unresponsive.

The record

CVE
CVE-2020-28496
Published
Feb 18, 2021
Updated
Sep 17, 2024
Vendor
mrdoob
Product
Three.js
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <0.125.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

mrdoob · Three.jsversion=unspecified <0.125.0

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS: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-400Uncontrolled Resource Consumption
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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