CVE-2026-85031

CRITICAL

A vulnerability was found in TOTOLINK CP450 4.1.0. The impacted element is an unknown function of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument topicurl results in buffer...

Affects 2 products across 1 vendor.

CVSS 3.19.9
CVSS v48.6
EPSS0.8%
Percentile55th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, low privileges required, no user interaction needed, can impact systems beyond the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-119: Improper Restriction of Operations within Memory Buffer

Parent class for buffer-related vulnerabilities where operations exceed buffer boundaries.

CWE-120: Buffer Copy without Checking Size (Classic Buffer Overflow)

Program copies data to a buffer without verifying the source data fits within the destination.

Related Attack Patterns (CAPEC)
CAPEC-8 Buffer Overflow in an API Call
via CWE-119 CWE-120
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-119 CWE-120
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-119 CWE-120
CAPEC-14 Client-side Injection-induced Buffer Overflow
via CWE-119 CWE-120
CAPEC-24 Filter Failure through Buffer Overflow
via CWE-119 CWE-120
Show all 14

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A critical severity vulnerability (CVE-2026-85031) affects the target system. A vulnerability was found in TOTOLINK CP450 4.1.0. The impacted element is an unknown function of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument topicurl results in buffer overflow. Remote exploitation of the attack is possi...

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Frequently Asked Questions
What is CVE-2026-85031?
A critical severity vulnerability (CVE-2026-85031) affects the target system. A vulnerability was found in TOTOLINK CP450 4.1.0. The impacted element is an unknown function of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument topicurl results in buffer overflow. Remote exploitation of the attack is possi...
What is the CVSS score for CVE-2026-85031?
CVE-2026-85031 has CVSS 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS: 0.8%.
Is CVE-2026-85031 actively exploited?
No confirmed active exploitation of CVE-2026-85031 as of 2026-09-04.
How do I remediate CVE-2026-85031?
Apply vendor patches for CVE-2026-85031. Monitor Totolink advisories.
What systems are affected by CVE-2026-85031?
CVE-2026-85031 affects Totolink Cp450.
Vulnerability Details
CVE IDCVE-2026-85031
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published2026-09-03
Last Modified2026-09-03
ICS Relevance15%
Weakness (CWE)
Improper Restriction of Operations within Memory BufferBuffer Copy without Checking Size (Classic Buffer Overflow)
SourceNVD
Official Description

A vulnerability was found in TOTOLINK CP450 4.1.0. The impacted element is an unknown function of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument topicurl results in buffer overflow. Remote exploitation of the attack is possible.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductAffected Versions
Totolink Cp450 (device & firmware) 4.1.0
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 42 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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