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Vulnerability record · CVE-2021-26709 · published 7 April 2021

CVE-2021-26709: D-link dsl-320b-d1 out-of-bounds write vulnerability

D Link · Dsl 320b D1

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

9.8 CVSS 3.1 Critical EPSS 40% · top 1.4% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 10.0
40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/162133/D-Link-DSL-320B-D1-Pre-Authentication-Buffer-Overflow.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2021/Apr/15 Mailing ListThird Party Advisory
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10216 Vendor Advisory
https://www.dlink.com/en/security-bulletin Vendor Advisory
http://packetstormsecurity.com/files/162133/D-Link-DSL-320B-D1-Pre-Authentication-Buffer-Overflow.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2021/Apr/15 Mailing ListThird Party Advisory
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10216 Vendor Advisory
https://www.dlink.com/en/security-bulletin Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-26709), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.