CVE-2021-27245
"TP-Link Archer A7/Archer C7 IPv6 SSH Connection Filtering Vulnerability"
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.
INFO
Published Date :
March 29, 2021, 9:15 p.m.
Last Modified :
Nov. 21, 2024, 5:57 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2021-27245
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Public PoC/Exploit Available at Github
CVE-2021-27245 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-27245.
| URL | Resource |
|---|---|
| https://www.zerodayinitiative.com/advisories/ZDI-21-214/ | Third Party Advisory VDB Entry |
| https://www.zerodayinitiative.com/advisories/ZDI-21-214/ | Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-27245 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-27245
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Repository that tracks public exploits, vulnerabilities and advisories that I [co-]discovered or [co-]authored.
Ruby Shell Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-27245 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-27245 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-214/ -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Apr. 01, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:C/I:C/A:C) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-214/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-214/ Third Party Advisory, VDB Entry Added CPE Configuration AND OR *cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:* versions up to (excluding) c7\(us\)_v5_210125 OR cpe:2.3:h:tp-link:archer_a7:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:* versions up to (excluding) a7\(us\)_v5_200220 OR cpe:2.3:h:tp-link:archer_a7:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 29, 2021
Action Type Old Value New Value Changed 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. 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.
Vulnerability Scoring Details
Base CVSS Score: 8.1
Base CVSS Score: 8.1
Base CVSS Score: 9.3
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
4.21 }} -4.19%
score
0.87672
percentile