CVE-2020-37123Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via shell metacharacters

Published Feb 5, 2026 · Updated Feb 5, 2026

OS command injection in wcchandler Pinger 1.0 allows remote attackers to execute arbitrary commands through ping.php parameters. The ping and socket branches concatenate their GET values into shell command strings passed to shell_exec, allowing appended metacharacters to create executable PHP files. No authentication or user interaction is required; network access to ping.php is enough to run commands with the web server process's privileges.

CVSS severity9.8
Critical
EPSS probability3.14%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in wcchandler Pinger 1.0 allows remote attackers to execute arbitrary commands through ping.php parameters. The ping and socket branches concatenate their GET values into shell command strings passed to shell_exec, allowing appended metacharacters to create executable PHP files. No authentication or user interaction is required; network access to ping.php is enough to run commands with the web server process's privileges.

The record

CVE
CVE-2020-37123
Published
Feb 5, 2026
Updated
Feb 5, 2026
Vendor
wcchandler
Product
Pinger
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2026Record 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=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

wcchandler · Pingerversion=1.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS: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.

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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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