CVE-2020-7672Public exploitNetwork attack vector

Arbitrary code execution via properties eval

Published Jun 10, 2020 · Updated Aug 4, 2024

Code injection in 4y0 mosc 1.0.0 and earlier allows remote attackers to execute arbitrary code through crafted properties input. The parse_properties path passes the properties argument to eval, causing embedded JavaScript expressions and statements to run without neutralization. Exploitation requires a consuming application to pass attacker-controlled properties data into that library path, after which code runs with the Node.js process's access.

CVSS severity8.6
High
EPSS probability1.94%
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 4y0 mosc 1.0.0 and earlier allows remote attackers to execute arbitrary code through crafted properties input. The parse_properties path passes the properties argument to eval, causing embedded JavaScript expressions and statements to run without neutralization. Exploitation requires a consuming application to pass attacker-controlled properties data into that library path, after which code runs with the Node.js process's access.

The record

CVE
CVE-2020-7672
Published
Jun 10, 2020
Updated
Aug 4, 2024
Vendor
4y0
Product
mosc
Classifications
CWE-94, 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 1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

4y0 · moscversion=All versions including 1.0.0

Published CVSS scores

8.6SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
8.6NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
7.5NVDAV: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 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-94Improper Control of Generation of Code ('Code Injection')
T1059.007JavaScript/JScript

Public exploit references

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Technologies

Your stack

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Your stack

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