WAVLINK Quantum D4G (WN531G3) Session Management by IP Address

published 2022-09-13 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-43896

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits: 0; none known

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.

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

youtu.be https://youtu.be/cSileV8YbsQ?t=655 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

WAVLINK WN531G3

Classification

Weakness

CWE-304 Missing Critical Step in Authentication
CWE-287 Improper Authentication

References

youtu.be /cSileV8YbsQ?t=655
exploit, third-party-advisory

Sources

CVE List CVE-2022-40622
NVD CVE-2022-40622

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary