CVE-2026-74233Zbtlink MQWrt infosrvd Command Injection
Updated under an hour ago ()
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It affects Zbtlink WE1326 and 15 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-321, CWE-78
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Aug 27, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Zbtlink WE1326 zbtlink:we1326 (from the name) | 19.1101 | CNA record |
Zbtlink WE2426-C zbtlink:we2426_c (from the name) | 19.1112 | CNA record |
Zbtlink WE357 zbtlink:we357 (from the name) | 19.1101 | CNA record |
Zbtlink WE5926 zbtlink:we5926 (from the name) | 19.1101 | CNA record |
Zbtlink WE5926-EC_QP zbtlink:we5926_ec_qp (from the name) | 20.0516 | CNA record |
Zbtlink WE5926-WD zbtlink:we5926_wd (from the name) | 19.1101 | CNA record |
Zbtlink WE826-Q zbtlink:we826_q (from the name) | 19.1101 | CNA record |
Zbtlink WE826-T2 zbtlink:we826_t2 (from the name) | 19.1101 | CNA record |
Zbtlink WE826-WD zbtlink:we826_wd (from the name) | 19.1101 | CNA record |
Zbtlink WF3526-P zbtlink:wf3526_p (from the name) | 19.051 | CNA record |
Zbtlink WG108 zbtlink:wg108 (from the name) | 19.1101 | CNA record |
Zbtlink WG3526 zbtlink:wg3526 (from the name) | 19.1101 | CNA record |
Unknown CTN720-W1 unknown:ctn720_w1 (from the name) | 19.1101 | CNA record |
Unknown LF-1541 unknown:lf_1541 (from the name) | 19.1101 | CNA record |
Unknown MT7620N unknown:mt7620n (from the name) | 19.1101 | CNA record |
Unknown WRC1 unknown:wrc1 (from the name) | 20.0622 | CNA record |
References
- http://vulncheck.com/blog/zbt-darklantern-speakingstonetechnical-description, exploit
- https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injectionthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.