CVE-2021-27245
8.1 · HIGHOverview
CVE-2021-27245 is a high-severity vulnerability affecting tp-link archer_a7_firmware. It was published on March 29, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from tp-link. Update archer_a7_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| tp-link | archer_a7_firmware | >= 0, < c7\(us\)_v5_210125 | Affected |
Frequently Asked Questions
What is CVE-2021-27245?
CVE-2021-27245 is a high-severity vulnerability affecting tp-link archer_a7_firmware. It was published on March 29, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2021-27245?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-27245?
Check the references section for vendor advisories and patches from tp-link. Update archer_a7_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-27245?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-27245 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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