Quick answers
- Is CVE-2026-124563 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124563 being exploited in the wild.
- How severe is CVE-2026-124563?
- High severity, with a CVSS score of 7.5, published 9 November 2026.
- Which products and versions are affected?
- D-Link DIR-878 1.20B05.
- Is there a fix for CVE-2026-124563?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-124563 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-124563?
- Check whether you run D-Link DIR-878 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow exists in the HNAP Handler's SetWanSettings function when processing Primary/Secondary DNS arguments. The vulnerability can be exploited remotely without authentication to achieve arbitrary code execution on the router. While no active exploitation in the wild has been reported, proof-of-concept code has been publicly released, increasing exploitation risk.
Affected products
- D-Link DIR-878 1.20B05
Timeline
- 2026-11-09: disclosed