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TI-2021-08785 Aliases CVE-2021-27245GHSA-fjjm-6vfr-rmxw

Protection mechanism failure in TP-Link Archer A7

Priority MEDIUM 41CWE-693Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-693.

Summary

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.

Why it matters now

EPSS 0.03329 88th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
TP-LinkArcher A7prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220—No fix listedCNA
  • Archer A7 VendorTP-Link Affected prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:*before c7\(us\)_v5_210125VulnerableTP-Link
cpe:2.3:h:tp-link:archer_a7:-:*:*:*:*:*:*:*not specified by NVDRunning onTP-Link
cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:*before a7\(us\)_v5_200220VulnerableTP-Link
  • cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:* Versions before c7\(us\)_v5_210125 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:archer_a7:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TP-Link
  • cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:* Versions before a7\(us\)_v5_200220 Vulnerable ·TP-Link

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27245
  2. 2026-10-03 Alias added: GHSA-fjjm-6vfr-rmxw

References

Advisory 1

  • TI-2021-18684 TP-Link Archer A7 Archer A7(US)_V5_210519 is affected by a command injection… CVSS 3.1CRITICAL 9.8
  • TI-2020-04723 Link following in TP-Link Archer A7 v5 CVSS 3.1MEDIUM 6.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences