CVE-2020-7677Public exploitNetwork attack vector

Code execution via eval of function name

Published Jul 25, 2022 · Updated Sep 16, 2024

Code injection in thenify before 3.3.1 allows attackers to execute arbitrary JavaScript through a crafted function name. The thenify and thenify.withCallback entry points interpolate fn.name into wrapper source and pass that source to eval without validating the name. Exploitation requires a consuming application to pass a function whose name an attacker controls, and code runs with the Node.js process's privileges.

CVSS severity9.8
Critical
EPSS probability1.98%
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 thenify before 3.3.1 allows attackers to execute arbitrary JavaScript through a crafted function name. The thenify and thenify.withCallback entry points interpolate fn.name into wrapper source and pass that source to eval without validating the name. Exploitation requires a consuming application to pass a function whose name an attacker controls, and code runs with the Node.js process's privileges.

The record

CVE
CVE-2020-7677
Published
Jul 25, 2022
Updated
Sep 16, 2024
Vendor
Thenify Project
Product
thenify
Classifications
CWE-78, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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 <3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Thenify Project · thenifyversion=unspecified <3.3.1

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.6SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

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-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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