Buffer Overflow Vulnerability in D-Link DIR-878 Router

CVE-2026-124563

What is CVE-2026-124563?

A buffer overflow vulnerability exists in the D-Link DIR-878 router's SetWanSettings function within the HNAP Handler. This flaw allows an attacker to manipulate input arguments, specifically Primary/Secondary, leading to potential remote exploitation. It's important to note that this issue affects products that are no longer actively supported by the vendor, increasing the risk for users still operating affected versions. As the exploit details have been publicly released, it poses a serious security risk that users must address promptly.

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