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CVE-2021-27245 Details

Description

This vulnerability allows a firewall bypass on affected installations of TP-Link Archer A7 prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220 AC1750 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of IPv6 connections. The issue results from the lack of proper filtering of IPv6 SSH connections. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-12309.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://www.zerodayinitiative.com/advisories/ZDI-21-214/	CVE	Third Party AdvisoryVDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-214/	[email protected]	Third Party AdvisoryVDB Entry

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-693	Protection Mechanism Failure	[email protected]

Affected Products

Product	Versions
tp-link archer a7 firmware	< c7\(us\)_v5_210125 < a7\(us\)_v5_200220
CPE cpe:2.3:o:tp-link:archer_a7_firmware:::::::: Remediation No remediation found in references.
tp-link archer a7	All versions
CPE cpe:2.3:h:tp-link:archer_a7:-:::::::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Apr 1, 2021	Initial Analysis	[email protected]
Mar 29, 2021	CVE Modified	[email protected]