How severe is CVE-2021-45391?

CVE-2021-45391 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-45391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45391?

CVE-2021-45391 affects Tenda Ax12 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45391?

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-2021-45391 published?

CVE-2021-45391 was published on 2022-02-16 and last updated on 2026-06-17.

CVE-2021-45391

CVE-2021-45391 is a high-severity vulnerability in Tenda Ax12 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Tenda Ax12 Firmware
Published: 2022-02-16
Last modified: 2026-06-17

Description

A Buffer Overflow vulnerability exists in Tenda Router AX12 V22.03.01.21_CN in the sub_422CE4 function in the goform/setIPv6Status binary file /usr/sbin/httpd via the conType parameter, which causes a Denial of Service.

Frequently asked questions

What is CVE-2021-45391?: A Buffer Overflow vulnerability exists in Tenda Router AX12 V22.03.01.21_CN in the sub_422CE4 function in the goform/setIPv6Status binary file /usr/sbin/httpd via the conType parameter, which causes a Denial of Service.
How severe is CVE-2021-45391?: CVE-2021-45391 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-45391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45391?: CVE-2021-45391 affects Tenda Ax12 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45391?: 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-2021-45391 published?: CVE-2021-45391 was published on 2022-02-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ax12_firmware:22.03.01.21_cn:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ax12 Firmware

CVE-2024-28383 — Critical (CVSS 9.8): Tenda AX12 v1.0 v22.03.01.16 was discovered to contain a stack overflow via the ssid parameter in the sub_431CF0…
CVE-2023-49437 — Critical (CVSS 9.8): Tenda AX12 V22.03.01.46 has been discovered to contain a command injection vulnerability in the 'list' parameter at…
CVE-2023-49428 — Critical (CVSS 9.8): Tenda AX12 V22.03.01.46 has been discovered to contain a command injection vulnerability in the 'mac' parameter at…
CVE-2023-49426 — Critical (CVSS 9.8): Tenda AX12 V22.03.01.46 was discovered to contain a stack overflow via the list parameter at /goform/SetStaticRouteCfg.
CVE-2023-49425 — Critical (CVSS 9.8): Tenda AX12 V22.03.01.46 was discovered to contain a stack overflow via the deviceList parameter at…
CVE-2023-49424 — Critical (CVSS 9.8): Tenda AX12 V22.03.01.46 was discovered to contain a stack overflow via the list parameter at…

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