How severe is CVE-2025-12209?

CVE-2025-12209 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-2025-12209 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-12209?

CVE-2025-12209 affects Tenda O3 Firmware1.0.0.10(2478). See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-12209?

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-2025-12209 have an EU (EUVD) identifier?

Yes. CVE-2025-12209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36067.

When was CVE-2025-12209 published?

CVE-2025-12209 was published on 2025-10-27 and last updated on 2026-06-17.

CVE-2025-12209

CVE-2025-12209 is a high-severity vulnerability in Tenda O3 Firmware1.0.0.10(2478) 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% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-36067
Weakness: CWE-119
Affected product: Tenda O3 Firmware1.0.0.10(2478)
Published: 2025-10-27
Last modified: 2026-06-17

Description

A vulnerability was determined in Tenda O3 1.0.0.10(2478). Affected is the function SetValue/GetValue of the file /goform/setDhcpConfig. Executing a manipulation of the argument dhcpEn can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized.

Frequently asked questions

What is CVE-2025-12209?: A vulnerability was determined in Tenda O3 1.0.0.10(2478). Affected is the function SetValue/GetValue of the file /goform/setDhcpConfig. Executing a manipulation of the argument dhcpEn can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized.
How severe is CVE-2025-12209?: CVE-2025-12209 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-2025-12209 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-12209?: CVE-2025-12209 affects Tenda O3 Firmware1.0.0.10(2478). See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-12209?: 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-2025-12209 have an EU (EUVD) identifier?: Yes. CVE-2025-12209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36067.
When was CVE-2025-12209 published?: CVE-2025-12209 was published on 2025-10-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:o3_firmware1.0.0.10\(2478\):*:*:*:*:*:*:*:*

More vulnerabilities in Tenda O3 Firmware1.0.0.10(2478)

CVE-2025-12214 — High (CVSS 8.8): A vulnerability was detected in Tenda O3 1.0.0.10(2478). This issue affects the function SetValue/GetValue of the file…
CVE-2025-12213 — High (CVSS 8.8): A security vulnerability has been detected in Tenda O3 1.0.0.10(2478). This vulnerability affects the function…
CVE-2025-12212 — High (CVSS 8.8): A weakness has been identified in Tenda O3 1.0.0.10(2478). This affects the function SetValue/GetValue of the file…
CVE-2025-12211 — High (CVSS 8.8): A security flaw has been discovered in Tenda O3 1.0.0.10(2478). Affected by this issue is the function…
CVE-2025-12210 — High (CVSS 8.8): A vulnerability was identified in Tenda O3 1.0.0.10(2478). Affected by this vulnerability is the function…
CVE-2024-6965 — High (CVSS 8.8): A vulnerability has been found in Tenda O3 1.0.0.10 and classified as critical. Affected by this vulnerability is the…

All CVEs affecting Tenda O3 Firmware1.0.0.10(2478) →

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 →