Quick answers
- Is CVE-2026-124562 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124562 being exploited in the wild.
- How severe is CVE-2026-124562?
- 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-2026-124562?
- No fixed version is recorded yet. Restrict network access to the HNAP Handler port on the device using firewall rules, or disable HNAP if not required for network management operations. 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-2026-124562 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-124562?
- 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.
How to fix
Restrict network access to the HNAP Handler port on the device using firewall rules, or disable HNAP if not required for network management operations.
Technical details
A stack buffer overflow exists in the SetWanSettings function of the HNAP Handler component when processing ConfigDNS/Primary and ConfigDNS/Secondary parameters. The vulnerability can be exploited remotely without authentication via HNAP protocol, allowing an attacker to overwrite stack memory and potentially achieve remote code execution or denial of service. No patch is available as the affected firmware version 1.20B05 is no longer supported.
Affected products
- D-Link DIR-878 1.20B05
Timeline
- 2026-11-09: disclosed