CVE-2026-74233: Zbtlink MQWrt infosrvd Command Injection
- Is it exploited?
Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .
VulnCheck KEV lists it since . It cites 1 public report, the first from . VulnCheck's own honeypots also recorded exploitation attempts.
- How likely is exploitation in the next 30 days?
- 3.4%
EPSS score, percentile 88.7 of all scored records. A probability estimated by FIRST, not a report of exploitation.
CISA's SSVC assessment in the CVE record lists exploitation as poc.
- How severe?
- 9.3 Critical
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 19.1101
- 19.1112
- 19.1101
- 19.1101
- 20.0516
- 19.1101
and 10 more in the table below
Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
Zbtlink MQWrt infosrvd Command Injection
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.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (16 products)
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1112 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 20.0516 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.051 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 19.1101 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 20.0622 |
Versions not listed are: unknown.
Source: CVE List, as of . About the data.
Weakness
CWE-321, CWE-78, 1 CAPEC
Attack patterns (CAPEC)
- CAPEC-88: OS Command Injection
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published |