EUVD-2026-26230Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
formMapDelDevice is an admin device-management endpoint typically requiring a session (PR:L); a stack overflow on unhardened embedded firmware plausibly yields code execution, so C/I/A:H, though NVD confirmed only availability.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionCVE.org
TOTOLINK A3002RU V3 <= V3.0.0-B20220304.1804 was discovered to contain a stack-based buffer overflow via the hostname parameter in the formMapDelDevice function.
AnalysisAI
Denial of service (and likely memory-corruption code execution) affects the TOTOLINK A3002RU V3 router through firmware V3.0.0-B20220304.1804, where the hostname parameter passed to the formMapDelDevice handler in the device's boa web server is copied into a fixed-size stack buffer without bounds checking. Remote attackers can send an oversized hostname value to crash the device or corrupt the stack. A public proof-of-concept exists on GitHub, but the issue is not in CISA KEV - no public exploit indicating active exploitation was identified, and EPSS remains very low at 0.04% (12th percentile).
Technical ContextAI
The affected component is the boa embedded HTTP daemon used in TOTOLINK's A3002RU firmware to serve the router's web management interface. The vulnerable code path is the formMapDelDevice CGI handler, which processes a hostname parameter - an operation associated with the LAN device-map/delete functionality. The root cause is CWE-121 (Stack-based Buffer Overflow): attacker-controlled input is written into a local stack buffer of fixed length without validating the input size, allowing adjacent stack memory (including saved registers and the return address) to be overwritten. On these MIPS/ARM SOHO devices such overflows commonly cause a service crash and, depending on stack layout and mitigations (typically absent on this class of hardware), can escalate to arbitrary code execution. The CPE string provided ('cpe:2.3:a:n/a:n/a:*') is a placeholder and does not usefully identify the product; identification here relies on the CVE description and the referenced PoC repository.
RemediationAI
No vendor-released patch was identified at time of analysis, and no fixed firmware version is present in the provided data, so a specific upgrade target cannot be cited - check TOTOLINK's official support site for A3002RU firmware newer than V3.0.0-B20220304.1804 before deploying any fix. As compensating controls, restrict access to the router's web administration interface to trusted LAN hosts only and ensure it is never exposed to the WAN/Internet (disable remote/WAN management), which removes the network attack surface at the cost of losing remote administration convenience. Place the device management VLAN behind firewall rules that block untrusted clients from reaching the HTTP admin service, and change default administrator credentials to reduce the chance of an attacker reaching the authenticated formMapDelDevice endpoint. Given this is a consumer-grade device likely at or near end of support, replacing it with a currently-maintained router is the most durable remediation. Refer to the public PoC (https://github.com/0xmania/cve/tree/main/TOTOLINK-A3002RUV3.0-boa-formMapDelDevice-StackOverflow) to validate exploitability in your environment.
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today