D-Link

CVE-2016-6563: D-Link DIR routers contain a stack-based buffer overflow in the HNAP Login action

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 27 Feb 2025. It cites 2 public reports, the first from 27 Feb 2025.

How likely is exploitation in the next 30 days?

79.7%

EPSS score, percentile 99.6 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

D-Link DIR routers contain a stack-based buffer overflow in the HNAP Login action

Processing malformed SOAP messages when performing the HNAP Login action causes a buffer overflow in the stack in some D-Link DIR routers. The vulnerable XML fields within the SOAP body are: Action, Username, LoginPassword, and Captcha. The following products are affected: DIR-823, DIR-822, DIR-818L(W), DIR-895L, DIR-890L, DIR-885L, DIR-880L, DIR-868L, and DIR-850L.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (9 products)

D-Link DIR-823
Status	Versions
Unknown	unspecified

D-Link DIR-822
Status	Versions
Unknown	unspecified

D-Link DIR-818L(W)
Status	Versions
Unknown	unspecified

D-Link DIR-895L
Status	Versions
Unknown	unspecified

D-Link DIR-890L
Status	Versions
Unknown	unspecified

D-Link DIR-885L
Status	Versions
Unknown	unspecified

D-Link DIR-880L
Status	Versions
Unknown	unspecified

D-Link DIR-868L
Status	Versions
Unknown	unspecified

D-Link DIR-850L
Status	Versions
Unknown	unspecified

Source: CVE List, as of 30 Oct 2026. About the data.

Weakness

CWE-121

CWE-121

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

Date	Event
13 Jul 2018	CVE record published
6 Aug 2024	CVE record last updated

References

VU#677427 (Third-party advisory)
40805 (Exploit)
94130 (Vulnerability database)
20161107 [CVE-2016-6563 / VU#677427]: Dlink DIR routers HNAP Login stack buffer overflow

Known exploited D-Link vulnerabilities

CVE-2025-29635: D-Link DIR-823X Command Injection Vulnerability (added 24 Apr 2026)
CVE-2022-37055: D-Link Routers Buffer Overflow Vulnerability (added 8 Dec 2025)
CVE-2020-25078: D-Link DCS-2530L and DCS-2670L Devices Unspecified Vulnerability (added 5 Aug 2025)
CVE-2020-25079: D-Link DCS-2530L and DCS-2670L Command Injection Vulnerability (added 5 Aug 2025)
CVE-2022-40799: D-Link DNR-322L Download of Code Without Integrity Check Vulnerability (added 5 Aug 2025)