CVE-2020-7673Public exploitNetwork attack vector

Arbitrary code execution via evaluated function argument

Published Jun 10, 2020 · Updated Aug 4, 2024

Code injection in node-extend 0.2.0 and earlier allows attackers to execute arbitrary JavaScript through a crafted first argument. The extend(A,B,as,isAargs) function in lib/extend.js passes attacker-controlled argument A to eval instead of treating it solely as data. Exploitation requires a consuming application to pass untrusted input as the first argument, and successful code runs with that application's privileges.

CVSS severity9.8
Critical
EPSS probability2.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in node-extend 0.2.0 and earlier allows attackers to execute arbitrary JavaScript through a crafted first argument. The extend(A,B,as,isAargs) function in lib/extend.js passes attacker-controlled argument A to eval instead of treating it solely as data. Exploitation requires a consuming application to pass untrusted input as the first argument, and successful code runs with that application's privileges.

The record

CVE
CVE-2020-7673
Published
Jun 10, 2020
Updated
Aug 4, 2024
Vendor
node-extend Project
Product
node-extend
Classifications
CWE-94, CWE-78, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2020CVE 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?

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

  1. Affected versionversion=All versions including 0.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

node-extend Project · node-extendversion=All versions including 0.2.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/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-94Improper Control of Generation of Code ('Code Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.007Command and Scripting Interpreter: JavaScript

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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