CVE-2021-27245: tp-link archer a7 firmware

csirt@kutim:~/threat-intel/cve/CVE-2021-27245

CVSS 8.1 · High EPSS 3,2%

Kerentanan Protection Mechanism Failure pada tp-link archer a7 firmware. Skor CVSS 3.1 8.1 (High) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD: 29 Maret 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 8.1 (High), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-693: Protection Mechanism Failure
EPSS (30 hari): 3,2% peluang dieksploitasi; lebih tinggi dari 87,8% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
tp-link	archer a7 firmware	Semua versi sebelum c7\(us\)_v5_210125
tp-link	archer a7 firmware	Semua versi sebelum a7\(us\)_v5_200220

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://www.zerodayinitiative.com/advisories/ZDI-21-214/ advisory pihak ketiga · vdb entry

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.