How severe is CVE-2022-40621?

CVE-2022-40621 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-40621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-40621?

CVE-2022-40621 affects Wavlink Wn531g3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-40621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2022-40621 published?

CVE-2022-40621 was published on 2022-09-13 and last updated on 2026-06-17.

CVE-2022-40621

CVE-2022-40621 is a high-severity vulnerability in Wavlink Wn531g3 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-294.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-294
Affected product: Wavlink Wn531g3 Firmware
Published: 2022-09-13
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2022-40621?: 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.
How severe is CVE-2022-40621?: CVE-2022-40621 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-40621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-40621?: CVE-2022-40621 affects Wavlink Wn531g3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-40621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-40621 published?: CVE-2022-40621 was published on 2022-09-13 and last updated on 2026-06-17.

References

https://www.malbytes.net/2022/07/wavlink-quantum-d4g-zero-day-part-01.html

Affected products (1)

cpe:2.3:o:wavlink:wn531g3_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Wavlink Wn531g3 Firmware

CVE-2022-40623 — High (CVSS 8.8): The WAVLINK Quantum D4G (WN531G3) running firmware version M31G3.V5030.200325 does not utilize anti-CSRF tokens, which,…
CVE-2022-40622 — High (CVSS 8.8): The WAVLINK Quantum D4G (WN531G3) running firmware version M31G3.V5030.200325 uses IP addresses to hold sessions and…
CVE-2020-10973 — High (CVSS 7.5): An issue was discovered in Wavlink WN530HG4, Wavlink WN531G3, Wavlink WN533A8, and Wavlink WN551K1 affecting…
CVE-2020-10972 — High (CVSS 7.5): An issue was discovered where a page is exposed that has the current administrator password in cleartext in the source…
CVE-2020-12266 — High (CVSS 7.5): An issue was discovered where there are multiple externally accessible pages that do not require any sort of…

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