CVE-2020-18980Public exploitNetwork attack vector

Unauthenticated command execution via theme cloning

Published Jul 12, 2021 · Updated Aug 4, 2024

OS command injection in Halo 0.4.3 allows remote attackers to execute arbitrary commands through the theme-cloning endpoint. The cloneFromRemote method concatenates the remoteAddr and themeName parameters into a git clone command passed to RuntimeUtil.execForStr without validation or escaping. An unauthenticated network request can inject shell metacharacters and run commands with the Halo server process's privileges.

CVSS severity9.8
Critical
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Halo 0.4.3 allows remote attackers to execute arbitrary commands through the theme-cloning endpoint. The cloneFromRemote method concatenates the remoteAddr and themeName parameters into a git clone command passed to RuntimeUtil.execForStr without validation or escaping. An unauthenticated network request can inject shell metacharacters and run commands with the Halo server process's privileges.

The record

CVE
CVE-2020-18980
Published
Jul 12, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2021CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

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

T1190Exploit Public-Facing Application
T1059Command and Scripting Interpreter

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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