How severe is CVE-2026-2872?

CVE-2026-2872 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-2026-2872 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2872?

CVE-2026-2872 affects Tenda A21 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2872?

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.

Does CVE-2026-2872 have an EU (EUVD) identifier?

Yes. CVE-2026-2872 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7516.

When was CVE-2026-2872 published?

CVE-2026-2872 was published on 2026-02-21 and last updated on 2026-06-17.

CVE-2026-2872

CVE-2026-2872 is a high-severity vulnerability in Tenda A21 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-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7516
Weakness: CWE-119
Affected product: Tenda A21 Firmware
Published: 2026-02-21
Last modified: 2026-06-17

Description

A security vulnerability has been detected in Tenda A21 1.0.0.0. This vulnerability affects the function set_device_name of the file /goform/setBlackRule of the component MAC Filtering Configuration Endpoint. Such manipulation of the argument devName/mac leads to stack-based buffer overflow. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

Frequently asked questions

What is CVE-2026-2872?: A security vulnerability has been detected in Tenda A21 1.0.0.0. This vulnerability affects the function set_device_name of the file /goform/setBlackRule of the component MAC Filtering Configuration Endpoint. Such manipulation of the argument devName/mac leads to stack-based buffer overflow. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.
How severe is CVE-2026-2872?: CVE-2026-2872 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-2026-2872 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2872?: CVE-2026-2872 affects Tenda A21 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2872?: 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.
Does CVE-2026-2872 have an EU (EUVD) identifier?: Yes. CVE-2026-2872 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7516.
When was CVE-2026-2872 published?: CVE-2026-2872 was published on 2026-02-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:a21_firmware:1.0.0.0:*:*:*:*:*:*:*

More vulnerabilities in Tenda A21 Firmware

CVE-2026-2886 — High (CVSS 8.8): A weakness has been identified in Tenda A21 1.0.0.0. This affects the function set_device_name of the file…
CVE-2026-2874 — High (CVSS 8.8): A flaw has been found in Tenda A21 1.0.0.0. Impacted is the function form_fast_setting_wifi_set of the file…
CVE-2026-2873 — High (CVSS 8.8): A vulnerability was detected in Tenda A21 1.0.0.0. This issue affects the function setSchedWifi of the file…
CVE-2026-2871 — High (CVSS 8.8): A weakness has been identified in Tenda A21 1.0.0.0. This affects the function fromSetIpMacBind of the file…
CVE-2026-2870 — High (CVSS 8.8): A security flaw has been discovered in Tenda A21 1.0.0.0. Affected by this issue is the function set_qosMib_list of the…

All CVEs affecting Tenda A21 Firmware →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →