CVE-2021-27246 - CVE House
Back to Database
Status published High CVE-2021-27246

This vulnerability allows network-adjacent attackers to execute arbitrary code on...

Vulnerability Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link Archer A7 AC1750 1.0.15 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of MAC addresses by the tdpServer endpoint. A crafted TCP message can write stack pointers to the stack. An attacker can leverage this vulnerability to execute code in the context of the root user. Was ZDI-CAN-12306.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-27246

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • @0xMitsurugi (Synacktiv), @swapgs (Synacktiv)

References

More from TP-Link

View All →
CVE-2025-40634
Stack-based buffer overflow in TP-Link Archer AX50
Critical 9.2
CVE-2025-3442
Information Disclosure Vulnerability in TP-Link Tapo IoT Smart Hub
Medium 4.4
CVE-2025-1099
Information Disclosure Vulnerability in TP-Link Tapo C500 Wi-Fi Camera
High 7
CVE-2025-0730
TP-Link TL-SG108E HTTP GET Request usr_account_set.cgi get request method with sensitive query strings
Medium 6.3
CVE-2025-0729
TP-Link TL-SG108E clickjacking
Medium 6.9

Affected Vendor

Affected Software

AC1750
Vulnerable Versions:
1.0.15 Build 20200628 rel.63501(4341)

Timeline

Official Publish: April 14th, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-121

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1055 Process Injection
Defense Evasion
T1105 Ingress Tool Transfer
Command and Control
T1485 Data Destruction
Impact