How severe is CVE-2026-2873?

CVE-2026-2873 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-2026-2873 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-2026-2873?

CVE-2026-2873 affects Tenda A21 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2873?

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-2026-2873 have an EU (EUVD) identifier?

Yes. CVE-2026-2873 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7534.

When was CVE-2026-2873 published?

CVE-2026-2873 was published on 2026-02-21 and last updated on 2026-06-17.

CVE-2026-2873

CVE-2026-2873 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-2026-7534
Weakness: CWE-119
Affected product: Tenda A21 Firmware
Published: 2026-02-21
Last modified: 2026-06-17

Description

A vulnerability was detected in Tenda A21 1.0.0.0. This issue affects the function setSchedWifi of the file /goform/openSchedWifi. Performing a manipulation of the argument schedStartTime/schedEndTime results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now public and may be used.

Frequently asked questions

What is CVE-2026-2873?: A vulnerability was detected in Tenda A21 1.0.0.0. This issue affects the function setSchedWifi of the file /goform/openSchedWifi. Performing a manipulation of the argument schedStartTime/schedEndTime results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now public and may be used.
How severe is CVE-2026-2873?: CVE-2026-2873 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-2026-2873 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-2026-2873?: CVE-2026-2873 affects Tenda A21 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2873?: 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-2026-2873 have an EU (EUVD) identifier?: Yes. CVE-2026-2873 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7534.
When was CVE-2026-2873 published?: CVE-2026-2873 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:*:*:*:*:*:*:*

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