What is CVE-2026-90693?

CVE-2026-90693 is a critical-severity vulnerability in D-Link Dir-878, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-09-14.

How severe is CVE-2026-90693?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Buffer overflow in D-Link Dir-878

CVE-2026-90693

A flaw has been found in D-Link DIR-878 120B05. This impacts the function SetWan3Settings of the component WAN Settings. This manipulation of the argument Primary/Secondary causes stack-based buffer overflow. Remote exploitation of the attack is possible.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (39.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

D-link Dir-878 — versions 120B05

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (related)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-90693?: CVE-2026-90693 is a critical-severity vulnerability in D-Link Dir-878, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-09-14.
How severe is CVE-2026-90693?: Critical severity. CVSS v3 base score is 9.9 out of 10.