Buffer overflow in D-Link Dir-878
CVE-2026-124560
A vulnerability was found in D-Link DIR-878 1.20B05. This affects the function GetCAPTCHAsetting of the file bin/prog.cgi of the component HNAP Handler. Performing a manipulation of the argument uid results in heap-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. 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 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
- github.com/Zimo-666/DIR-878-cves/tree/main/01-captcha-uid-heap-overflow (exploit, broken-link)
- vuldb.com/cve/CVE-2026-124560 (third-party-advisory)
- vuldb.com/submit/1035616 (third-party-advisory)
- vuldb.com/vuln/432892 (technical-description, vdb-entry)
- vuldb.com/vuln/432892/cti (signature, permissions-required)
- www.dlink.com/ (product)
Frequently asked questions
- What is CVE-2026-124560?
- CVE-2026-124560 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: 9.8/10. Published 2026-11-09.
- How severe is CVE-2026-124560?
- Critical severity. CVSS v3 base score is 9.8 out of 10.