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ZdiCVELIST:CVE-2021-27245

HistoryMar 29, 2021 - 9:05 p.m.

CVE-2021-27245

2021-03-2921:05:33

CWE-693

zdi

www.cve.org

firewall bypass

tp-link archer a7

ipv6 connections

authentication bypass

code execution

root access

zdi-can-12309

CVSS3

8.1

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

8.4

Confidence

High

EPSS

0.005

Percentile

77.2%

JSON

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.

CNA Affected

[
  {
    "product": "Archer A7",
    "vendor": "TP-Link",
    "versions": [
      {
        "status": "affected",
        "version": "prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220"
      }
    ]
  }
]

References

www.zerodayinitiative.com/advisories/ZDI-21-214/

CVSS3

8.1

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

8.4

Confidence

High

EPSS

0.005

Percentile

77.2%

JSON

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