How severe is CVE-2025-65220?

CVE-2025-65220 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-65220 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65220?

CVE-2025-65220 affects Tenda Ac21 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65220?

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

Does CVE-2025-65220 have an EU (EUVD) identifier?

Yes. CVE-2025-65220 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198263.

When was CVE-2025-65220 published?

CVE-2025-65220 was published on 2025-11-20 and last updated on 2026-06-17.

CVE-2025-65220

CVE-2025-65220 is a medium-severity vulnerability in Tenda Ac21 Firmware with a CVSS 3.x base score of 4.3. 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-121.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198263
Weakness: CWE-121
Affected product: Tenda Ac21 Firmware
Published: 2025-11-20
Last modified: 2026-06-17

Description

Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow in: /goform/SetVirtualServerCfg via the list parameter.

Frequently asked questions

What is CVE-2025-65220?: Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow in: /goform/SetVirtualServerCfg via the list parameter.
How severe is CVE-2025-65220?: CVE-2025-65220 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-65220 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65220?: CVE-2025-65220 affects Tenda Ac21 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65220?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-65220 have an EU (EUVD) identifier?: Yes. CVE-2025-65220 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198263.
When was CVE-2025-65220 published?: CVE-2025-65220 was published on 2025-11-20 and last updated on 2026-06-17.

References

https://github.com/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/VULN1.md

Affected products (1)

cpe:2.3:o:tenda:ac21_firmware:16.03.08.16:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac21 Firmware

CVE-2025-9605 — Critical (CVSS 9.8): A security vulnerability has been detected in Tenda AC21 and AC23 16.03.08.16. Affected is the function…
CVE-2026-4565 — High (CVSS 8.8): A vulnerability was detected in Tenda AC21 16.03.08.16. Impacted is the function formSetQosBand of the file…
CVE-2026-1637 — High (CVSS 8.8): A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of…
CVE-2025-13446 — High (CVSS 8.8): A vulnerability has been found in Tenda AC21 16.03.08.16. This vulnerability affects unknown code of the file…
CVE-2025-13445 — High (CVSS 8.8): A flaw has been found in Tenda AC21 16.03.08.16. This affects an unknown part of the file /goform/SetIpMacBind.…
CVE-2025-12611 — High (CVSS 8.8): A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of…

All CVEs affecting Tenda Ac21 Firmware →

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities

CVE-2026-12848 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12847 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12846 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12485 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-37541 — Critical (CVSS 10.0): Buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) 3.3.005. In canformat_gvret.cpp, the length…
CVE-2026-42996 — Critical (CVSS 10.0): JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a stack-based buffer overflow via a radio transmission of…

Browse all CWE-121 (Stack-based Buffer Overflow) vulnerabilities →