CVE-2026-24110

CRITICAL
2026-03-02 [email protected]
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Mar 03, 2026 - 15:51 vuln.today
Public exploit code
CVE Published
Mar 02, 2026 - 16:16 nvd
CRITICAL 9.8

Tags

Buffer Overflow W20e Firmware

Description

An issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may send overly long `addDhcpRules` data. When these rules enter the `addDhcpRule` function and are processed by `ret = sscanf(pRule, " %d\t%[^\t]\t%[^\n\r\t]", &dhcpsIndex, dhcpsIP, dhcpsMac);`, the lack of size validation for the rules could lead to buffer overflows in `dhcpsIndex`, `dhcpsIP`, and `dhcpsMac`.

Analysis

Tenda W20E has an eighth buffer overflow in addDhcpRules parameter.

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Remediation

Within 24 hours: inventory all Tenda W20E V4.0br devices in your network and isolate them to a restricted management VLAN. Within 7 days: implement network segmentation to limit access to affected devices and disable DHCP rule management features if operationally feasible, or apply WAF/IDS signatures to block malformed addDhcpRules requests. …

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Priority Score

69
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: +20

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CVE-2026-24110 vulnerability details – vuln.today
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