TI-2021-13852 Aliases CVE-2021-34862 GHSA-p2jj-p9xc-7g6j

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 handling of the var:menu parameter provided to the webproc endpoint. 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-13270.

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-2021-34862
2026-10-03 Alias added: GHSA-p2jj-p9xc-7g6j

References

Patch 1

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

Advisory 1

https://www.zerodayinitiative.com/advisories/ZDI-21-978/

TI-2024-03070 D-Link DNS-320L/DNS-325/DNS-327L/DNS-340L HTTP GET Request nas_sharing.cgi command injection KEVCVSS 3.1CRITICAL 9.8
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