Vulnerability Details : CVE-2021-27245

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.
Published 2021-03-29 21:15:13
Updated 2021-04-01 18:46:55
Source Zero Day Initiative
View at NVD,   CVE.org
Vulnerability category: Execute code

Exploit prediction scoring system (EPSS) score for CVE-2021-27245

EPSS FAQ
0.53%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 75 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-27245

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
9.3
 HIGH AV:N/AC:M/Au:N/C:C/I:C/A:C
8.6
10.0
 NIST
8.1
 HIGH CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.2
5.9
 Zero Day Initiative
8.1
 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.2
5.9
 NIST

CWE ids for CVE-2021-27245

  • The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
    Assigned by: zdi-disclosures@trendmicro.com (Primary)

References for CVE-2021-27245

Products affected by CVE-2021-27245

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