WAVLINK Quantum D4G M31G3.V5030.200325 missing critical step in authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability has been found in WAVLINK Quantum D4G M31G3.V5030.200325 and classified as problematic. The CWE definition for the vulnerability is CWE-304. The software implements an authentication technique, but it skips a step that weakens the technique. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The WAVLINK Quantum D4G (WN531G3) running firmware version M31G3.V5030.200325 uses IP addresses to hold sessions and does not not use session tokens. Therefore, if an attacker changes their IP address to match the logged-in administrator's, or is behind the same NAT as the logged in administrator, session takeover is possible.

The weakness was released 09/14/2022. The advisory is shared at youtu.be. This vulnerability is known as CVE-2022-40622 since 09/12/2022. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/14/2022).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.




CPE 2.3info

CPE 2.2info


Youtube: Not available anymore


VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍



VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍


Class: Remote Code Execution
CWE: CWE-304
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒


09/12/2022 CVE reserved
09/14/2022 +2 days Advisory disclosed
09/14/2022 +0 days VulDB entry created
09/14/2022 +0 days VulDB last update


Advisory: youtu.be
Status: Not defined

CVE: CVE-2022-40622 (🔒)


Created: 09/14/2022 12:21 PM
Changes: (1) source_videolink
Complete: 🔍


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