CVE-2021-26709

** UNSUPPORTED WHEN ASSIGNED ** D-Link DSL-320B-D1 devices through EU_1.25 are prone to multiple...

9.8 Critical

D-Link DSL-320B-D1 devices through EU_1.25 are prone to multiple Stack-Based Buffer Overflows that allow unauthenticated remote attackers to take over a device via the login.xgi user and pass parameters. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

40.1%Up 38.8 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2021-26709
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 10.0 HighAV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-26709
Updated: 2026-11-02

EUVDEUVD-2021-13498 No score

Record: EUVD-2021-13498
Updated: 2026-11-03

GitHub AdvisoriesGHSA-rpch-r72m-hrcf 9.8

** UNSUPPORTED WHEN ASSIGNED ** D-Link DSL-320B-D1 devices through EU_1.25 are prone to multiple...

** UNSUPPORTED WHEN ASSIGNED ** D-Link DSL-320B-D1 devices through EU_1.25 are prone to multiple Stack-Based Buffer Overflows that allow unauthenticated remote attackers to take over a device via the login.xgi user and pass parameters. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Record: GHSA-rpch-r72m-hrcf
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

Affected products

d-link dsl-320b-d1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26709 is a critical vulnerability (CVSS 9.8) in D-link Dsl-320b-d1, published April 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 40.1%, the 98th percentile. No source names a fixed version.