How severe is CVE-2021-33964?

CVE-2021-33964 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33964 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33964?

CVE-2021-33964 affects Chinamobile An Lianbao Wf-1 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33964?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-33964 published?

CVE-2021-33964 was published on 2022-01-18 and last updated on 2026-06-17.

CVE-2021-33964

CVE-2021-33964 is a high-severity vulnerability in Chinamobile An Lianbao Wf-1 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Chinamobile An Lianbao Wf-1 Firmware
Published: 2022-01-18
Last modified: 2026-06-17

Description

China Mobile An Lianbao WF-1 V1.0.1 router provides a web interface /api/ZRRuleFilter/set_firewall_level which receives parameters by POST request, and the parameter firewall_level has a command injection vulnerability. An attacker can use the vulnerability to execute remote commands.

Frequently asked questions

What is CVE-2021-33964?: China Mobile An Lianbao WF-1 V1.0.1 router provides a web interface /api/ZRRuleFilter/set_firewall_level which receives parameters by POST request, and the parameter firewall_level has a command injection vulnerability. An attacker can use the vulnerability to execute remote commands.
How severe is CVE-2021-33964?: CVE-2021-33964 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33964 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33964?: CVE-2021-33964 affects Chinamobile An Lianbao Wf-1 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33964?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-33964 published?: CVE-2021-33964 was published on 2022-01-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:chinamobile:an_lianbao_wf-1_firmware:1.0.1:*:*:*:*:*:*:*

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