CVE-2026-5815 — D-Link DIR-645 Vulnerability

What is CVE-2026-5815?

A vulnerability was detected in D-Link DIR-645 1.01/1.02/1.03. Impacted is the function hedwigcgi_main of the file /cgi-bin/hedwig.cgi. The manipulation results in stack-based buffer overflow. The attack can be launched remotely. The exploit is now public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

The record classifies CVE-2026-5815 under weakness classes CWE-121, CWE-119. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 203 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
CVSS v4.0 base score: 8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
EPSS (FIRST): 0.9% probability of exploitation in the next 30 days, higher than 58.7% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 8.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-04-08, last modified 2026-04-13

Is CVE-2026-5815 being exploited?

Weaponised exploit code for CVE-2026-5815 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 28 in the Threadlinqs vulnerability feed.

trickest/cve (trickest)

Affected products and versions

D-Link: DIR-645

How to fix CVE-2026-5815

No vendor patch reference has been recorded for CVE-2026-5815 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.