How severe is CVE-2021-3186?

CVE-2021-3186 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-3186 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3186?

CVE-2021-3186 affects Tenda Ac5 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3186?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-3186 published?

CVE-2021-3186 was published on 2021-01-26 and last updated on 2026-06-17.

CVE-2021-3186

CVE-2021-3186 is a medium-severity vulnerability in Tenda Ac5 Firmware with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 4.3
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Tenda Ac5 Firmware
Published: 2021-01-26
Last modified: 2026-06-17

Description

A Stored Cross-site scripting (XSS) vulnerability in /main.html Wifi Settings in Tenda AC5 AC1200 version V15.03.06.47_multi allows remote attackers to inject arbitrary web script or HTML via the Wifi Name parameter.

Frequently asked questions

What is CVE-2021-3186?: A Stored Cross-site scripting (XSS) vulnerability in /main.html Wifi Settings in Tenda AC5 AC1200 version V15.03.06.47_multi allows remote attackers to inject arbitrary web script or HTML via the Wifi Name parameter.
How severe is CVE-2021-3186?: CVE-2021-3186 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-3186 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3186?: CVE-2021-3186 affects Tenda Ac5 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3186?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3186 published?: CVE-2021-3186 was published on 2021-01-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ac5_firmware:15.03.06.47:*:*:*:*:*:*:*

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