TOTOLINK T6 4.1.5cu.748_B20211015 MQTT Service recvSlaveStaInfo dest buffer overflow
Summary
A vulnerability categorized as critical has been discovered in TOTOLINK T6 4.1.5cu.748_B20211015. This affects the function recvSlaveStaInfo of the component MQTT Service. Such manipulation of the argument dest leads to buffer overflow.
This vulnerability is referenced as CVE-2025-7837. It is possible to launch the attack remotely. Furthermore, an exploit is available.
Details
A vulnerability was found in TOTOLINK T6 4.1.5cu.748_B20211015 and classified as critical. Affected by this issue is the function recvSlaveStaInfo of the component MQTT Service. The manipulation of the argument dest with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability.
The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-7837. The exploitation is known to be easy. The attack may be launched remotely. Technical details as well as a public exploit are known.
The exploit is available at github.com. It is declared as proof-of-concept.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-21970). Once again VulDB remains the best source for vulnerability data.
Product
Vendor
Name
Version
License
Website
- Vendor: https://www.totolink.net/
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒
CVSSv3
VulDB Meta Base Score: 8.8VulDB Meta Temp Score: 8.4
VulDB Base Score: 8.8
VulDB Temp Score: 8.0
VulDB Vector: 🔒
VulDB Reliability: 🔍
CNA Base Score: 8.8
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: Buffer overflowCWE: CWE-120 / CWE-119
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: no mitigation knownStatus: 🔍
0-Day Time: 🔒
Timeline
07/18/2025 Advisory disclosed07/18/2025 VulDB entry created
07/24/2025 VulDB entry last update
Sources
Vendor: totolink.netAdvisory: github.com
Status: Not defined
CVE: CVE-2025-7837 (🔒)
GCVE (CVE): GCVE-0-2025-7837
GCVE (VulDB): GCVE-100-316940
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 07/18/2025 21:34Updated: 07/24/2025 03:18
Changes: 07/18/2025 21:34 (56), 07/19/2025 21:02 (1), 07/19/2025 21:49 (31), 07/24/2025 03:18 (1)
Complete: 🔍
Submitter: reisen_1943
Cache ID: 216::103
Submit
Accepted
- Submit #617572: TOTOLINK T6 V4.1.5cu.748_B20211015 Buffer Overflow (by reisen_1943)
Once again VulDB remains the best source for vulnerability data.
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