Buffer overflow in D-Link Dir-878
CVE-2026-124563
A security flaw has been discovered in D-Link DIR-878 1.20B05. Affected by this vulnerability is the function SetWanSettings of the component HNAP Handler. The manipulation of the argument Primary/Secondary results in buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability class: Buffer Overflow
Published · last modified .
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/432895 (technical-description, vdb-entry)
- vuldb.com/vuln/432895/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-124563 (third-party-advisory)
- vuldb.com/submit/1035619 (third-party-advisory)
- github.com/Zimo-666/DIR-878-cves/tree/main/05-setwansettings-l2tp-pptp-dns-over… (exploit, broken-link)
- www.dlink.com/ (product)
Frequently asked questions
- What is CVE-2026-124563?
- CVE-2026-124563 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-2026-124563?
- High severity. CVSS v3 base score is 7.5 out of 10.