CVE-2024-29973Known exploitationPublic exploitNetwork attack vector

Command execution via unauthenticated eval injection

Published Jun 4, 2024 · Updated Aug 2, 2024

OS command injection in Zyxel NAS326 and NAS542 firmware allows remote attackers to execute commands through crafted HTTP POST data. The unauthenticated /cmd,/simZysh/register_main/setCookie route passes attacker-controlled controller, action, and argument text into Python eval(). A substring-based authentication exclusion exposes the route remotely, and injected subprocess calls run commands under the web server account.

CVSS severity9.8
Critical
EPSS probability86.09%
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 Zyxel NAS326 and NAS542 firmware allows remote attackers to execute commands through crafted HTTP POST data. The unauthenticated /cmd,/simZysh/register_main/setCookie route passes attacker-controlled controller, action, and argument text into Python eval(). A substring-based authentication exclusion exposes the route remotely, and injected subprocess calls run commands under the web server account.

The record

CVE
CVE-2024-29973
Published
Jun 4, 2024
Updated
Aug 2, 2024
Vendor
Zyxel Networks
Product
NAS542 Firmware
Classifications
CWE-78, T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.21\(abag.14\)co
  2. Affected versionversion=< V5.21(ABAG.14)C0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zyxel Networks · NAS542 Firmwareversion=0 <5.21\(abag.14\)co; version=< V5.21(ABAG.14)C0
Zyxel Networks · NAS326 Firmwareversion=0 <v5.21\(aazf.17\)co; version=< V5.21(AAZF.17)C0

Published CVSS scores

9.8Zyxel CorporationCVSS: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')
T1059.006Command and Scripting Interpreter: Python

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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