---
title: "CVE-2021-40655: D-Link DIR-605 Router Information Disclosure Vulnerability"
url: https://erroneo.us/security/cve/CVE-2021-40655/
description: "CVE-2021-40655 (D-Link DIR-605 Router): Exploited in the wild (CISA KEV). An informtion disclosure issue exists in D-LINK-DIR-605 B2 Firmware Version …"
type: vulnerability-record
section: "Security Digest"
date_published: 2021-09-24
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2021-40655"
kev: true
cvss: 7.5
epss: 0.86659
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2021-40655: D-Link DIR-605 Router Information Disclosure Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run D-Link DIR-605 Router. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-05-16, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-06-06 ; treat that as the outer limit, not the target.
- EPSS 86.7% , percentile 99.7: FIRST’s model estimates a 86.7% chance of exploitation activity in the next 30 days, higher than 99.7% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

An informtion disclosure issue exists in D-LINK-DIR-605 B2 Firmware Version : 2.01MT. An attacker can obtain a user name and password by forging a post request to the / getcfg.php page

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 7.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

## Exploitation

- CISA KEV: added 2024-05-16; federal due date 2024-06-06. Known ransomware use: Unknown.
- CISA required action: This vulnerability affects legacy D-Link products. All associated hardware revisions have reached their end-of-life (EOL) or end-of-service (EOS) life cycle and should be retired and replaced per vendor instructions.
- CISA SSVC assessment: exploitation active , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 86.66% probability of exploitation activity in the next 30 days; percentile 99.7.

## Sources

- [Listed in CISA KEV notes (legacy.us.dlink.com)](https://legacy.us.dlink.com/pages/product.aspx?id=2b09e95d90ff4cb38830ecc04c89cee5)
- [CVE.org record CVE-2021-40655](https://www.cve.org/CVERecord?id=CVE-2021-40655)
- [NVD entry CVE-2021-40655](https://nvd.nist.gov/vuln/detail/CVE-2021-40655)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40655)
- [dlink.com](https://www.dlink.com/en/security-bulletin/)
- [github.com](https://github.com/Ilovewomen/D-LINK-DIR-605/)

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Source page: https://erroneo.us/security/cve/CVE-2021-40655/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt