How severe is CVE-2016-6669?

CVE-2016-6669 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-6669 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6669?

CVE-2016-6669 primarily affects Huawei Usg2100 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6669?

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-2016-6669 published?

CVE-2016-6669 was published on 2016-09-22 and last updated on 2026-06-17.

CVE-2016-6669

CVE-2016-6669 is a high-severity vulnerability in Huawei Usg2100 Firmware with a CVSS 3.x base score of 7.5. 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-119.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.1
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Huawei Usg2100 Firmware
Published: 2016-09-22
Last modified: 2026-06-17

Description

Buffer overflow in the Authentication, Authorization and Accounting (AAA) module in Huawei USG2100, USG2200, USG5100, and USG5500 unified security gateways with software before V300R001C10SPC600 allows remote authenticated RADIUS servers to execute arbitrary code by sending a crafted EAP packet.

Frequently asked questions

What is CVE-2016-6669?: Buffer overflow in the Authentication, Authorization and Accounting (AAA) module in Huawei USG2100, USG2200, USG5100, and USG5500 unified security gateways with software before V300R001C10SPC600 allows remote authenticated RADIUS servers to execute arbitrary code by sending a crafted EAP packet.
How severe is CVE-2016-6669?: CVE-2016-6669 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-6669 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6669?: CVE-2016-6669 primarily affects Huawei Usg2100 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6669?: 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-2016-6669 published?: CVE-2016-6669 was published on 2016-09-22 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:huawei:usg2100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:usg2200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:usg5100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:usg5500_firmware:*:*:*:*:*:*:*:*

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