Firewall Bypass in TP-Link Archer A7 Routers
CVE-2021-27245

8.1HIGH

Key Information:

Vendor

Tp-link
Status
Archer A7
Vendor
CVE Published:
29 March 2021

What is CVE-2021-27245?

This vulnerability permits a possible firewall bypass on specific TP-Link Archer A7 routers that handle IPv6 connections improperly. The flaw arises from insufficient filtering of IPv6 SSH connections, which allows an unauthorized attacker to exploit the vulnerability without needing authentication. When combined with other security flaws, this opens a pathway for code execution with root privileges, potentially compromising the device's integrity.

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Affected Version(s)

Archer A7 prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220

References

https://www.zerodayinitiative.com/advisories/ZDI-21-214/
x_refsource_MISC

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Team FLASHBACK: Pedro Ribeiro (@pedrib1337 | pedrib@gmail.com) + Radek Domanski (@RabbitPro)
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