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Totolink WA300 EUVD-2026-26868

| CVE-2026-7717 HIGH
Classic Buffer Overflow (CWE-120)
2026-05-04 VulDB
Buffer Overflow
7.4
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

6
PoC Detected
May 04, 2026 - 15:18 vuln.today
Public exploit code
Analysis Generated
May 04, 2026 - 01:48 vuln.today
CVSS changed
May 04, 2026 - 01:22 NVD
8.8 (HIGH) 7.4 (HIGH)
EUVD ID Assigned
May 04, 2026 - 01:15 euvd
EUVD-2026-26868
Analysis Generated
May 04, 2026 - 01:15 vuln.today
CVE Published
May 04, 2026 - 01:00 nvd
HIGH 7.4

DescriptionNVD

A vulnerability was determined in Totolink WA300 5.2cu.7112_B20190227. This issue affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. Executing a manipulation of the argument File can lead to buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized.

AnalysisAI

Buffer overflow in Totolink WA300 wireless range extender firmware 5.2cu.7112_B20190227 allows authenticated remote attackers to execute arbitrary code or crash the device via crafted File parameter to the UploadCustomModule function in /cgi-bin/cstecgi.cgi. Public proof-of-concept exploit exists (documented in Notion page), enabling low-skill exploitation. …

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RemediationAI

Within 24 hours: Inventory all Totolink WA300 devices and identify those running firmware 5.2cu.7112_B20190227 or earlier; isolate affected devices from untrusted network segments if feasible. Within 7 days: Contact Totolik support to confirm patch availability timeline and expected release date; implement network-level access controls restricting access to /cgi-bin/cstecgi.cgi to trusted administrative IPs only. …

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EUVD-2026-26868 vulnerability details – vuln.today
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