CVE-2025-14964Network attack vector

Pre-authentication memory corruption via unbounded sprintf

Published Dec 19, 2025 · Updated Dec 19, 2025

Stack-based buffer overflow in TOTOLINK T10 4.1.8cu.5083_B20200521 allows remote attackers to corrupt memory via an HTTP login request. The pre-authentication login path in /cgi-bin/cstecgi.cgi uses sprintf to combine the POST body and Host header into a fixed 4,096-byte stack buffer without length checks. No authentication is required, and oversized input can corrupt memory and interrupt the router service; code execution has not been demonstrated.

CVSS severity9.8
Critical
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TOTOLINK T10 4.1.8cu.5083_B20200521 allows remote attackers to corrupt memory via an HTTP login request. The pre-authentication login path in /cgi-bin/cstecgi.cgi uses sprintf to combine the POST body and Host header into a fixed 4,096-byte stack buffer without length checks. No authentication is required, and oversized input can corrupt memory and interrupt the router service; code execution has not been demonstrated.

The record

CVE
CVE-2025-14964
Published
Dec 19, 2025
Updated
Dec 19, 2025
Vendor
TOTOLINK
Product
T10
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.8cu.5083_B20200521

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · T10version=4.1.8cu.5083_B20200521

Published CVSS scores

9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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