# D-Link DIR-605 Router Information Disclosure · pwn.watch

> D-Link DIR-605 routers contain an information disclosure vulnerability that allows attackers to obtain a username and password by forging a post request to the /getcfg.php page. Added to the CISA KEV catalog on 2024-05-16. CVE-2021-40655 was assigned before 2024; the KEV listing came in 2024.

Page: https://pwn.watch/i/d-link-dir-605-router-cve-2021-40655 · generated 2026-10-22T19:29:07.289Z

## Status
- Severity: high · status: closed · patch: unpatched
- Product: D-Link DIR-605 Router
- Started: 2024-05-16 · closed: 2024-05-16
- CVEs: CVE-2021-40655
- Affected: See vendor advisory (versions are not listed in the KEV record)
- Fixed in: No fix: CISA says the product is end-of-life and should be retired

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/d-link-dir-605-router-cve-2021-40655/feed.xml
- JSON Feed: https://pwn.watch/i/d-link-dir-605-router-cve-2021-40655/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/d-link-dir-605-router-cve-2021-40655.json
- This file: https://pwn.watch/i/d-link-dir-605-router-cve-2021-40655/llms.txt

## Updates (newest first)
- 2024-05-16: CISA added CVE-2021-40655 to the KEV catalog (federal deadline 2024-06-06) (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)

## Fix brief
# Security brief: D-Link DIR-605 Router Information Disclosure

Source: https://pwn.watch/i/d-link-dir-605-router-cve-2021-40655 · status: closed (closed May 16, 2024) · severity: high · updated May 16, 2024

## Patch status
**UNPATCHED: no fixed release yet. Apply mitigations and watch for updates.**

## What it is
D-Link DIR-605 routers contain an information disclosure vulnerability that allows attackers to obtain a username and password by forging a post request to the /getcfg.php page. Added to the CISA KEV catalog on 2024-05-16. CVE-2021-40655 was assigned before 2024; the KEV listing came in 2024.

Severity detail: CVSS 7.5 (v3.1, CISA-ADP), actively exploited (CISA KEV)

- Product: D-Link DIR-605 Router
- CVE / advisory ids: CVE-2021-40655

## Affected versions
- See vendor advisory (versions are not listed in the KEV record)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- No fix: CISA says the product is end-of-life and should be retired

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Mitigations
The data marks this as unpatched. Until every affected component is fixed, apply the vendor mitigations from the advisories below (restrict network exposure of the affected service, disable the vulnerable feature if the advisory allows).

## Secrets to rotate
This incident involves possible credential exposure. Rotate any credentials (API keys, tokens, env vars, SSH keys) that were present on affected systems or in affected builds while vulnerable/compromised versions were installed, and review access logs.

## Latest updates
- May 16, 2024: CISA added CVE-2021-40655 to the KEV catalog (federal deadline 2024-06-06)

## Advisories
- [D-Link advisory: CVE-2021-40655](https://legacy.us.dlink.com/pages/product.aspx?id=2b09e95d90ff4cb38830ecc04c89cee5) (D-Link)
- [NVD: CVE-2021-40655](https://nvd.nist.gov/vuln/detail/CVE-2021-40655) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).

---
Machine-readable: https://pwn.watch/i/d-link-dir-605-router-cve-2021-40655.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.