What is CVE-2026-124561?

CVE-2026-124561 is a high-severity vulnerability in D-Link Dir-878, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2026-11-09.

How severe is CVE-2026-124561?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in D-Link Dir-878

CVE-2026-124561

A vulnerability was determined in D-Link DIR-878 1.20B05. This impacts the function SetVLANSettings of the file prog.cgi of the component HNAP Handler. Executing a manipulation of the argument VID can lead to stack-based buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. This vulnerability only affects products that are no longer supported by the maintainer.

Vulnerability class: Buffer Overflow

Published 2026-11-09 · last modified 2026-11-09.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

D-Link Dir-878 — versions 1.20B05

Weakness classification (CWE)

References

vuldb.com/vuln/432893 (technical-description, vdb-entry)
vuldb.com/vuln/432893/cti (signature, permissions-required)
vuldb.com/cve/CVE-2026-124561 (third-party-advisory)
vuldb.com/submit/1035617 (third-party-advisory)
github.com/Zimo-666/DIR-878-cves/tree/main/03-settriggeradic-vlan-stack-overflow (exploit, broken-link)
www.dlink.com/ (product)

Frequently asked questions

What is CVE-2026-124561?: CVE-2026-124561 is a high-severity vulnerability in D-Link Dir-878, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2026-11-09.
How severe is CVE-2026-124561?: High severity. CVSS v3 base score is 7.5 out of 10.