What is CVE-2025-5623?

CVE-2025-5623 is a critical-severity vulnerability in D-link Dir-816, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-06-05.

How severe is CVE-2025-5623?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in D-link Dir-816

CVE-2025-5623

A vulnerability was found in D-Link DIR-816 1.10CNB05. It has been classified as critical. This affects the function qosClassifier of the file /goform/qosClassifier. The manipulation of the argument dip_address/sip_address leads to stack-b…

Vulnerability class: Buffer Overflow

EPSS: 0.036 (88.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

D-link Dir-816 — versions 1.10CNB05

Weakness classification (CWE)

References

VDB-311109 | D-Link DIR-816 qosClassifier stack-based overflow (vdb-entry, technical-description)
VDB-311109 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #589224 | D-Link DIR816 1.10CNB05 Stack-based Buffer Overflow (third-party-advisory)
github.com/wudipjq/my_vuln/blob/main/D-Link5/vuln_51/51.md (exploit)
www.dlink.com/ (product)

Frequently asked questions

What is CVE-2025-5623?: CVE-2025-5623 is a critical-severity vulnerability in D-link Dir-816, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-06-05.
How severe is CVE-2025-5623?: Critical severity. CVSS v3 base score is 9.8 out of 10.