CVE-2021-44079Public exploitNetwork attack vector

Remote code execution via single-quote shell injection

Published Nov 22, 2021 · Updated Aug 4, 2024

Command injection in Wazuh 4.2.0 through 4.2.4 allows remote attackers to execute commands through crafted User-Agent log data. The wazuh-slack script embeds alert JSON, including the raw log line, inside a single-quoted curl command passed to system(), so an injected quote terminates the data argument and appends shell syntax. Exploitation requires the Slack active response to process an alert containing attacker-controlled log content; successful injection runs commands with the script's privileges.

CVSS severity9.8
Critical
EPSS probability3.40%
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 Wazuh 4.2.0 through 4.2.4 allows remote attackers to execute commands through crafted User-Agent log data. The wazuh-slack script embeds alert JSON, including the raw log line, inside a single-quoted curl command passed to system(), so an injected quote terminates the data argument and appends shell syntax. Exploitation requires the Slack active response to process an alert containing attacker-controlled log content; successful injection runs commands with the script's privileges.

The record

CVE
CVE-2021-44079
Published
Nov 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS: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 exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

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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