TOTOLINK T6 MQTT Packet wireless.so ckeckKeepAlive command injection
A vulnerability classified as critical was found in TOTOLINK T6 4.1.5cu.748. This vulnerability affects the function ckeckKeepAlive of the file wireless.so of the component MQTT Packet Handler. The manipulation leads to command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
- Published
- Jul 21, 2025
- Updated
- Jun 17, 2026
- EPSS
- 21.0% · 97th percentile
- CWE
- CWE-74
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Report tools
Action score
14
Monitor
Low priority for now.
- CVSS
- 8 / 40 · 2.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 6 / 30 · 21.0%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · VulDB
- 5.3
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- totolink t6 firmwarev4.1.5cu.748_b20211015
Versions reported by the vendor
Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.
TOTOLINK T6
- 4.1.5cu.748affected
Same product
totolink: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-25084TOTOLink T6 V5.9c.4085_B20190428 was discovered to contain a command injection vulnerability in the "Main" function.46Plan
- CVE-2022-38828TOTOLINK T6 V4.1.5cu.709_B20210518 is vulnerable to command injection via cstecgi.cgi45Plan
- CVE-2022-38827TOTOLINK T6 V4.1.5cu.709_B20210518 is vulnerable to Buffer Overflow via cstecgi.cgi43Plan
- CVE-2022-25137A command injection vulnerability in the function recvSlaveUpgstatus of TOTOLINK Technology routers T6 V3_Firmware T6_V3_V4.1.5cu.748_B2021140Plan
- CVE-2022-25136A command injection vulnerability in the function meshSlaveUpdate of TOTOLINK Technology routers T6 V3_Firmware T6_V3_V4.1.5cu.748_B2021101540Plan
- CVE-2022-25135A command injection vulnerability in the function recv_mesh_info_sync of TOTOLINK Technology router T6 V3_Firmware T6_V3_V4.1.5cu.748_B2021140Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- ElvisBlue (VulDB User)reporter
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2025-76137 days apartTOTOLINK T6 HTTP POST Request cstecgi.cgi CloudSrvVersionCheck command injection9Monitor
- CVE-2025-76147 days apartTOTOLINK T6 HTTP POST Request cstecgi.cgi delDevice command injection9Monitor
- CVE-2025-76157 days apartTOTOLINK T6 HTTP POST Request cstecgi.cgi clearPairCfg command injection9Monitor
- CVE-2025-75248 days apartTOTOLINK T6 HTTP POST Request cstecgi.cgi setDiagnosisCfg command injection9Monitor
- CVE-2025-75258 days apartTOTOLINK T6 HTTP POST Request cstecgi.cgi setTracerouteCfg command injection9Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
- CVE-2025-78622 days apartTOTOLINK T6 Telnet Service cstecgi.cgi setTelnetCfg missing authentication22Monitor
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- HTTP Request SplittingCAPEC-105likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- Format String InjectionCAPEC-135likelihood: High · High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.