# CVE-2026-118579 — D-Link DIR-505

> As of 2026-10-29, CVE-2026-118579 is a CRITICAL-severity vulnerability in D-Link DIR-505, CVSS v3.1 9.8, EPSS 0.7% (56.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-118579 as of 2026-10-29; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-10-29

## What is CVE-2026-118579?

A weakness has been identified in D-Link DIR-505 1.10B02. The impacted element is the function main of the file /secmark1524.cgi of the component Web Management CGI. This manipulation of the argument accu/pass/code/hash/cmds causes backdoor. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

The record classifies CVE-2026-118579 under weakness class [CWE-912](https://intel.threadlinqs.com/cwe/CWE-912). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, 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 3 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 0.7% probability of exploitation in the next 30 days, higher than 56.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-28, last modified 2026-10-29

## Is CVE-2026-118579 being exploited?

It currently carries a trending score of 44 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [D-Link](https://intel.threadlinqs.com/vendors/d-link): DIR-505

## How to fix CVE-2026-118579

No vendor patch reference has been recorded for CVE-2026-118579 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-118579

No threat campaign in the Threadlinqs corpus currently references CVE-2026-118579, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-10-29.

**Exploit and proof of concept**

- [github.com — exploit](https://github.com/Walnut1337/DIR-505_backdoor/tree/main/poc)

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/428018)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/428018/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-118579)
- [vuldb.com — third party advisory (1025351)](https://vuldb.com/submit/1025351)

**Issue tracking and product pages**

- [dlink.com — product](https://www.dlink.com/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-118579
Full detection coverage and IOCs for threats exploiting CVE-2026-118579 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp