CVE-2022-40621Public exploitNetwork attack vector

Account takeover via replayable HTTP password hashes

Published Sep 13, 2022 · Updated Sep 17, 2024

Authentication bypass in Wavlink Quantum D4G firmware M31G3.V5030.200325 and earlier allows remote attackers to assume a user's identity. The management interface sends a reusable password hash over HTTP and derives it without a server-supplied key, allowing capture and replay. Network access and a logged-on victim are required; successful replay grants the victim's management privileges.

CVSS severity7.5
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Wavlink Quantum D4G firmware M31G3.V5030.200325 and earlier allows remote attackers to assume a user's identity. The management interface sends a reusable password hash over HTTP and derives it without a server-supplied key, allowing capture and replay. Network access and a logged-on victim are required; successful replay grants the victim's management privileges.

The record

CVE
CVE-2022-40621
Published
Sep 13, 2022
Updated
Sep 17, 2024
Vendor
Wavlink
Product
WAVLINK QUANTUM D4G (WL-WN531G3)
Classifications
CWE-294, T1550.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=M31G3.V5030.200325 <=M31G3.V5030.200325

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wavlink · WAVLINK QUANTUM D4G (WL-WN531G3)version=M31G3.V5030.200325 <=M31G3.V5030.200325

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
T1550.002Pass the Hash

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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