Vulnerability details
CVE-2026-74233
Zbtlink WE1326Zbtlink WE2426-CZbtlink WE357Zbtlink WE5926Zbtlink WE5926-EC_QPZbtlink WE5926-WD
Zbtlink MQWrt infosrvd Command Injection
CVSS 4.0
9.3Critical
Official description
Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Zbtlink | WE1326 | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE2426-C | 19.1112 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE357 | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE5926 | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE5926-EC_QP | 20.0516 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE5926-WD | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE826-Q | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE826-T2 | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WE826-WD | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WF3526-P | 19.051 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WG108 | 19.1101 | CVEProject cvelistV5 (CNA) |
| Zbtlink | WG3526 | 19.1101 | CVEProject cvelistV5 (CNA) |
| — | CTN720-W1 | 19.1101 | CVEProject cvelistV5 (CNA) |
| — | LF-1541 | 19.1101 | CVEProject cvelistV5 (CNA) |
| — | MT7620N | 19.1101 | CVEProject cvelistV5 (CNA) |
| — | WRC1 | 20.0622 | CVEProject cvelistV5 (CNA) |
References and advisories
2- http://vulncheck.com/blog/zbt-darklantern-speakingstone technical-descriptionexploit
- https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection third-party-advisory
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Details
- Published
- 2026-08-27
- Last updated
- 2026-08-27
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
3.37%
Probability of exploitation in 30 days
88.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-321Use of Hard-coded Cryptographic Key
- CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')