CVE-2021-33964Network attack vector

Authenticated command injection via firewall_level parameter

Published Jan 18, 2022 · Updated Aug 4, 2024

Command injection in China Mobile An Lianbao WF-1 V1.0.1 router allows remote authenticated users to execute commands via a POST request. The /api/ZRRuleFilter/set_firewall_level endpoint passes the firewall_level parameter into command processing without adequate neutralization, enabling injected shell commands. Access requires a low-privilege authenticated web session; successful exploitation can compromise confidentiality, integrity, and availability through remote command execution.

CVSS severity8.8
High
EPSS probability2.87%
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 China Mobile An Lianbao WF-1 V1.0.1 router allows remote authenticated users to execute commands via a POST request. The /api/ZRRuleFilter/set_firewall_level endpoint passes the firewall_level parameter into command processing without adequate neutralization, enabling injected shell commands. Access requires a low-privilege authenticated web session; successful exploitation can compromise confidentiality, integrity, and availability through remote command execution.

The record

CVE
CVE-2021-33964
Published
Jan 18, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 18, 2022CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV:N/AC:L/Au:S/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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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