TI-2021-13851 Aliases CVE-2021-34861 GHSA-3gm8-9xxm-pmhh

Stack-based buffer overflow in D-Link DAP-2020

MEDIUM 40CWE-121Published 2021-10-25 · Updated 2024-08-04

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the webproc endpoint, which listens on TCP port 80 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12104.

Why it matters now

EPSS 0.00821 57th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
D-Link	DAP-2020	1.01rc001	—	No fix listed	CNA

DAP-2020 VendorD-Link Affected 1.01rc001 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:dlink:dap-2020_firmware::::::::	up to 1.01	Vulnerable	D-Link Japan K.K.
cpe:2.3:h:dlink:dap-2020::::::::	all versions	Running on	D-Link Japan K.K.

cpe:2.3:o:dlink:dap-2020_firmware:*:*:*:*:*:*:*:* Versions up to 1.01 Vulnerable ·D-Link Japan K.K.
cpe:2.3:h:dlink:dap-2020:*:*:*:*:*:*:*:* Versions all versions Running on ·D-Link Japan K.K.

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-34861
2026-10-03 Alias added: GHSA-3gm8-9xxm-pmhh

References

Patch 1

https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201

Advisory 1

https://www.zerodayinitiative.com/advisories/ZDI-21-977/

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TI-2024-03069 D-Link DNS-320L/DNS-325/DNS-327L/DNS-340L HTTP GET Request nas_sharing.cgi hard-coded credentials KEVCVSS 3.1CRITICAL 9.8
TI-2024-00708 D-Link DIR-859 HTTP POST Request hedwig.cgi path traversal KEVCVSS 3.1CRITICAL 9.8
TI-2023-10693 OS Command injection vulnerability in D-Link DIR820LA1_FW105B03 allows attackers to… KEVCVSS 3.1CRITICAL 9.8
TI-2022-17249 D-Link Go-RT-AC750 GORTAC750_revA_v101b03 and GO-RT-AC750_revB_FWv200b02 are vulnerable… KEVCVSS 3.1CRITICAL 9.8
TI-2022-09657 D-Link DIR-820L 1.05B03 was discovered to contain remote command execution (RCE)… KEVCVSS 3.1CRITICAL 9.8

See all 979 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences