CVE-2020-7623Network attack vector

Arbitrary command execution via unescaped source argument

Published Apr 2, 2020 · Updated Aug 4, 2024

Command injection in fengmk2 jscover 1.0.0 and earlier allows attackers to execute arbitrary OS commands via the source argument. The exported jscover function concatenates the unescaped source value into a shell command string passed to child_process.exec. Exploitation requires attacker influence over the source value supplied by consuming code and runs commands with the Node.js process privileges.

CVSS severity9.8
Critical
EPSS probability3.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in fengmk2 jscover 1.0.0 and earlier allows attackers to execute arbitrary OS commands via the source argument. The exported jscover function concatenates the unescaped source value into a shell command string passed to child_process.exec. Exploitation requires attacker influence over the source value supplied by consuming code and runs commands with the Node.js process privileges.

The record

CVE
CVE-2020-7623
Published
Apr 2, 2020
Updated
Aug 4, 2024
Vendor
fengmk2
Product
jscover
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 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 1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

fengmk2 · jscoverversion=All versions including 1.0.0

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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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