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TI-2021-10081 Aliases CVE-2021-29280GHSA-qcq8-mgfx-4pfj

In TP-Link Wireless N Router WR840N an ARP poisoning attack can cause buffer overflow

Priority LOW 30CWE-668Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

In TP-Link Wireless N Router WR840N an ARP poisoning attack can cause buffer overflow

Why it matters now

EPSS 0.00754 55th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
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
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tp-link:tl-wr840n_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableTP-Link
cpe:2.3:h:tp-link:tl-wr840n:-:*:*:*:*:*:*:*not specified by NVDRunning onTP-Link
  • cpe:2.3:o:tp-link:tl-wr840n_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:tl-wr840n:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TP-Link

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29280
  2. 2026-10-03 Alias added: GHSA-qcq8-mgfx-4pfj

References

Exploit 1

Advisory 1

  • TI-2023-27456 Authentication bypass by spoofing in TP-Link TL-WR841N KEVCVSS 3.1MEDIUM 6.5
  • TI-2021-18357 The PING function on the TP-Link TL-WR840N EU v5 router with firmware through… CVSS 3.1CRITICAL 9.8
  • TI-2018-08378 An issue was discovered on TP-Link TL-WR840N v5 00000005 0.9.1 3.16 v0001.0 Build 170608… CVSS 3.0CRITICAL 9.8
  • TI-2022-08817 TP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
  • TI-2026-02790 Authenticated Command Injection on TP-Link TL-WR802N, TL-WR841N and TL-WR840N CVSS 4.0HIGH 8.5
  • TI-2022-08816 TP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
See all 21 →

Sources

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