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TI-2021-08786 Aliases CVE-2021-27246GHSA-5q6x-hwjj-x4pq

Stack-based buffer overflow in TP-Link AC1750

Priority MEDIUM 44CWE-121Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.06598 93rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
TP-LinkAC17501.0.15 Build 20200628 rel.63501(4341)—No fix listedCNA
  • AC1750 VendorTP-Link Affected 1.0.15 Build 20200628 rel.63501(4341) Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tp-link:ac1750_firmware:1.0.15:*:*:*:*:*:*:*1.0.15VulnerableTP-Link
cpe:2.3:h:tp-link:ac1750:a7:*:*:*:*:*:*:*a7Running onTP-Link
  • cpe:2.3:o:tp-link:ac1750_firmware:1.0.15:*:*:*:*:*:*:* Versions 1.0.15 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:ac1750:a7:*:*:*:*:*:*:* Versions a7 Running on ·TP-Link

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27246
  2. 2026-10-03 Alias added: GHSA-5q6x-hwjj-x4pq

References

Advisory 1

  • TI-2020-17194 tdpServer on TP-Link Archer A7 AC1750 devices before 201029 allows remote attackers to… CVSS 3.1CRITICAL 9.8
  • TI-2020-08763 OS command injection in TP-Link Archer A7 CVSS 3.1HIGH 8.8
  • TI-2020-08765 Hard-coded credentials in TP-Link Archer A7 CVSS 3.1HIGH 8.8
  • TI-2020-08762 Stack-based buffer overflow in TP-Link Archer A7 CVSS 3.1CRITICAL 9.8
  • TI-2020-08766 Improper input validation in TP-Link Archer A7 CVSS 3.1CRITICAL 9.8
  • TI-2020-08767 OS command injection in TP-Link Archer A7 CVSS 3.1CRITICAL 9.8
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences