CVE-2021-27245 Security feature bypass in Archer A7
Attackers can bypass firewall restrictions on TP-Link Archer routers by exploiting improper IPv6 SSH filtering, potentially enabling further root code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-27245?
CVE-2021-27245 is a high-severity vulnerability in TP-Link Archer A7, published on 29 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-693
Which versions are affected by CVE-2021-27245?
It affects 1 product.
Products include Tp-Link Archer A7 Firmware.
How do I fix CVE-2021-27245?
No fix has been published for CVE-2021-27245 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-27245 being exploited?
There is no known exploitation of CVE-2021-27245 in the wild and no public exploit code.
Other vulnerabilities in TP-Link Archer A7
Sources
Also known as GHSA-fjjm-6vfr-rmxw.