Advisory Details

February 24th, 2021

TP-Link Archer A7 Protection Mechanism Failure Firewall Bypass Vulnerability

CVE ID	CVE-2021-27245
CVSS SCORE	8.1, AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	TP-Link
AFFECTED PRODUCTS	Archer A7
VULNERABILITY DETAILS	This vulnerability allows a firewall bypass on affected installations of TP-Link Archer A7 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.
ADDITIONAL DETAILS	Fixed in V5
DISCLOSURE TIMELINE	2020-11-06 - Vulnerability reported to vendor 2021-02-24 - Coordinated public release of advisory 2021-03-19 - Advisory Updated
CREDIT	Team FLASHBACK: Pedro Ribeiro (@pedrib1337 \| pedrib@gmail.com) + Radek Domanski (@RabbitPro)

BACK TO ADVISORIES