How severe is CVE-2024-4251?

CVE-2024-4251 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-2024-4251 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-4251?

CVE-2024-4251 affects Tenda I21 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-4251?

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-2024-4251 have an EU (EUVD) identifier?

Yes. CVE-2024-4251 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-32803.

When was CVE-2024-4251 published?

CVE-2024-4251 was published on 2024-04-27 and last updated on 2026-06-17.

CVE-2024-4251

CVE-2024-4251 is a high-severity vulnerability in Tenda I21 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-32803
Weakness: CWE-787
Affected product: Tenda I21 Firmware
Published: 2024-04-27
Last modified: 2026-06-17

Description

A vulnerability was found in Tenda i21 1.0.0.14(4656). It has been rated as critical. Affected by this issue is the function fromDhcpSetSer of the file /goform/DhcpSetSe. The manipulation of the argument dhcpStartIp/dhcpEndIp/dhcpGw/dhcpMask/dhcpLeaseTime/dhcpDns1/dhcpDns2 leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-262142 is the identifier assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2024-4251?: A vulnerability was found in Tenda i21 1.0.0.14(4656). It has been rated as critical. Affected by this issue is the function fromDhcpSetSer of the file /goform/DhcpSetSe. The manipulation of the argument dhcpStartIp/dhcpEndIp/dhcpGw/dhcpMask/dhcpLeaseTime/dhcpDns1/dhcpDns2 leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-262142 is the identifier assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2024-4251?: CVE-2024-4251 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-2024-4251 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-4251?: CVE-2024-4251 affects Tenda I21 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-4251?: 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-2024-4251 have an EU (EUVD) identifier?: Yes. CVE-2024-4251 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-32803.
When was CVE-2024-4251 published?: CVE-2024-4251 was published on 2024-04-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:i21_firmware:1.0.0.14\(4656\):*:*:*:*:*:*:*

More vulnerabilities in Tenda I21 Firmware

CVE-2022-44367 — Critical (CVSS 9.8): Tenda i21 V1.0.0.14(4656) is vulnerable to Buffer Overflow via /goform/setUplinkInfo.
CVE-2022-44366 — Critical (CVSS 9.8): Tenda i21 V1.0.0.14(4656) is vulnerable to Buffer Overflow via /goform/setDiagnoseInfo.
CVE-2022-44365 — Critical (CVSS 9.8): Tenda i21 V1.0.0.14(4656) has a stack overflow vulnerability via /goform/setSysPwd.
CVE-2022-44363 — Critical (CVSS 9.8): Tenda i21 V1.0.0.14(4656) is vulnerable to Buffer Overflow via /goform/setSnmpInfo.
CVE-2022-44362 — Critical (CVSS 9.8): Tenda i21 V1.0.0.14(4656) is vulnerable to Buffer Overflow via /goform/AddSysLogRule.
CVE-2024-4497 — High (CVSS 8.8): A vulnerability was found in Tenda i21 1.0.0.14(4656). It has been declared as critical. This vulnerability affects the…

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