How severe is CVE-2021-46265?

CVE-2021-46265 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-46265 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46265?

CVE-2021-46265 affects Tenda Ac11 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-46265?

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

When was CVE-2021-46265 published?

CVE-2021-46265 was published on 2022-02-15 and last updated on 2026-06-17.

CVE-2021-46265

CVE-2021-46265 is a critical-severity vulnerability in Tenda Ac11 Firmware with a CVSS 3.x base score of 9.8. 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-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Tenda Ac11 Firmware
Published: 2022-02-15
Last modified: 2026-06-17

Description

Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wanBasicCfg module. This vulnerability allows attackers to cause a Denial of Service (DoS) via crafted overflow data.

Frequently asked questions

What is CVE-2021-46265?: Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wanBasicCfg module. This vulnerability allows attackers to cause a Denial of Service (DoS) via crafted overflow data.
How severe is CVE-2021-46265?: CVE-2021-46265 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-46265 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46265?: CVE-2021-46265 affects Tenda Ac11 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-46265?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-46265 published?: CVE-2021-46265 was published on 2022-02-15 and last updated on 2026-06-17.

References

https://github.com/Ainevsia/CVE-Request/tree/main/Tenda/13

Affected products (1)

cpe:2.3:o:tenda:ac11_firmware:02.03.01.104_cn:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac11 Firmware

CVE-2021-46321 — Critical (CVSS 9.8): Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wifiBasicCfg…
CVE-2021-46264 — Critical (CVSS 9.8): Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the onlineList…
CVE-2021-46263 — Critical (CVSS 9.8): Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wifiTime module.…
CVE-2021-46262 — Critical (CVSS 9.8): Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the PPPoE module.…
CVE-2021-31758 — Critical (CVSS 9.8): An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow…
CVE-2021-31757 — Critical (CVSS 9.8): An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow…

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