WAVLINK Quantum D4G (WN531G3) Pass-The-Hash

published 2022-09-13 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-43895

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

Because the WAVLINK Quantum D4G (WN531G3) running firmware version M31G3.V5030.200325 and earlier communicates over HTTP and not HTTPS, and because the hashing mechanism does not rely on a server-supplied key, it is possible for an attacker with sufficient network access to capture the hashed password of a logged on user and use it in a classic Pass-the-Hash style attack.

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

malbytes.net https://www.malbytes.net/2022/07/wavlink-quantum-d4g-zero-day-part-01.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

WAVLINK WN531G3

Classification

Weakness

CWE-294 Authentication Bypass by Capture-replay

References

malbytes.net /2022/07/wavlink-quantum-d4g-zero-day-part-01.html
exploit, third-party-advisory

Sources

CVE List CVE-2022-40621
NVD CVE-2022-40621

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