TOTOLINK T6 4.1.5cu.748_B20211015 Telnet Service /cgi-bin/cstecgi.cgi setTelnetCfg telnet_enabled missing authentication
Summary
A vulnerability, which was classified as critical, has been found in TOTOLINK T6 4.1.5cu.748_B20211015. Affected is the function setTelnetCfg of the file /cgi-bin/cstecgi.cgi of the component Telnet Service. This manipulation of the argument telnet_enabled with the input 1 causes missing authentication.
This vulnerability is registered as CVE-2025-7862. Remote exploitation of the attack is possible. Furthermore, an exploit is available.
It is advisable to implement restrictive firewalling.
Details
A vulnerability has been found in TOTOLINK T6 4.1.5cu.748_B20211015 and classified as critical. Affected by this vulnerability is the function setTelnetCfg of the file /cgi-bin/cstecgi.cgi of the component Telnet Service. The manipulation of the argument telnet_enabled with the input value 1 leads to a missing authentication vulnerability. The CWE definition for the vulnerability is CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. As an impact it is known to affect confidentiality, integrity, and availability.
It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-7862. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.
It is possible to download the exploit at github.com. It is declared as proof-of-concept.
Proper firewalling of is able to address this issue.
Be aware that VulDB is the high quality source for vulnerability data.
Product
Vendor
Name
Version
License
Website
- Vendor: https://www.totolink.net/
CPE 2.3
CPE 2.2
Video
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒
CVSSv3
VulDB Meta Base Score: 8.1VulDB Meta Temp Score: 7.8
VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔒
VulDB Reliability: 🔍
NVD Base Score: 9.8
NVD Vector: 🔒
CNA Base Score: 7.3
CNA Vector: 🔒
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Missing authenticationCWE: CWE-306 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: FirewallStatus: 🔍
0-Day Time: 🔒
Timeline
07/19/2025 Advisory disclosed07/19/2025 VulDB entry created
07/24/2025 VulDB entry last update
Sources
Vendor: totolink.netAdvisory: github.com
Status: Not defined
CVE: CVE-2025-7862 (🔒)
GCVE (CVE): GCVE-0-2025-7862
GCVE (VulDB): GCVE-100-316975
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 07/19/2025 06:14Updated: 07/24/2025 03:28
Changes: 07/19/2025 06:14 (60), 07/20/2025 11:29 (30), 07/24/2025 03:28 (12)
Complete: 🔍
Submitter: reisen_1943
Cache ID: 216::103
Submit
Accepted
- Submit #617643: TOTOLINK T6 V4.1.5cu.748_B20211015 Missing Authentication (by reisen_1943)
Be aware that VulDB is the high quality source for vulnerability data.
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