Totolink A8000RU 7.1cu.643_b20200521 CGI /cgi-bin/cstecgi.cgi setAdvancedInfoShow tty_server os command injection
Summary
A vulnerability identified as critical has been detected in Totolink A8000RU 7.1cu.643_b20200521. This impacts the function setAdvancedInfoShow of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument tty_server leads to os command injection.
This vulnerability is listed as CVE-2026-7154. The attack may be initiated remotely. In addition, an exploit is available.
Details
A vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521 and classified as critical. This issue affects the function setAdvancedInfoShow of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument tty_server with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability.
The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-7154. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1202 for this issue.
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-2026-25918). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Product
Vendor
Name
Version
License
Website
- Vendor: https://www.totolink.net/
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 9.8VulDB Meta Temp Score: 8.9
VulDB Base Score: 9.8
VulDB Temp Score: 8.9
VulDB Vector: 🔒
VulDB Reliability: 🔍
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: Os command injectionCWE: CWE-78 / CWE-77 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
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
04/26/2026 Advisory disclosed04/26/2026 VulDB entry created
04/28/2026 VulDB entry last update
Sources
Vendor: totolink.netAdvisory: github.com
Status: Not defined
CVE: CVE-2026-7154 (🔒)
GCVE (CVE): GCVE-0-2026-7154
GCVE (VulDB): GCVE-100-359753
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 04/26/2026 22:13Updated: 04/28/2026 00:12
Changes: 04/26/2026 22:13 (57), 04/28/2026 00:12 (1)
Complete: 🔍
Submitter: LtzHuster2
Cache ID: 216::103
Submit
Accepted
- Submit #801140: Totolink A8000RU 7.1cu.643_b20200521 Command Injection (by LtzHuster2)
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
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