---
id: CVE-2026-102812
title: >-
  Hardcoded AES-128 Key and Fixed IV in Configuration Backup Encryption in
  TP-Link RE305 and Archer C7
summary: |-
  A hard-coded
  cryptographic key vulnerability exists in the user-configuration backup
  mechanism of TP-Link RE305 V3 and Archer C7 V5. A fixed AES-128 key and
  initialization vector are embedded in the firmware configuration-management
  comp…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-321
vendor: TP-Link Systems Inc.
product: RE305 v3
affected:
  - re305_v3 < 1.1.8 Build 20260921 Rel. 42853
  - archer_c7_v5 < 1.3.1 Build 20260821 Rel. 41256
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-04T16:59:39.254453Z'
published: '2026-10-27'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T16:59:50.707Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-102812'
references:
  - url: 'https://www.tp-link.com/us/support/download/re305/v3/#Firmware'
  - url: 'https://www.tp-link.com/en/support/download/re305/v3/#Firmware'
  - url: 'https://www.tp-link.com/en/support/download/archer-c7/v5/#Firmware'
  - url: 'https://www.tp-link.com/us/support/download/archer-c7/v5/#Firmware'
  - url: 'https://www.tp-link.com/us/support/faq/5362/'
tags:
  - cve.org
epss: 0.0012
epssPercentile: 0.0185
ingestedAt: '2026-10-27T17:54:31.808Z'
---

## Overview

A hard-coded
cryptographic key vulnerability exists in the user-configuration backup
mechanism of TP-Link RE305 V3 and Archer C7 V5. A fixed AES-128 key and
initialization vector are embedded in the firmware configuration-management
component. An attacker who obtains an affected configuration backup file may
extract the cryptographic material from the firmware and use it to decrypt the
backup. 









Successful
exploitation may disclose sensitive configuration information contained in a
backup file, including administrator passwords and Wi-Fi credentials.

## Affected

- `re305_v3 < 1.1.8 Build 20260921 Rel. 42853`
- `archer_c7_v5 < 1.3.1 Build 20260821 Rel. 41256`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.