TI-2021-18357 Aliases CVE-2021-41653 GHSA-8fx7-hx38-cm88

The PING function on the TP-Link TL-WR840N EU v5 router with firmware through…

HIGH 81CWE-94Published 2021-11-13 · Updated 2026-07-09

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
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-94.

Summary

The PING function on the TP-Link TL-WR840N EU v5 router with firmware through TL-WR840N(EU)_V5_171211 is vulnerable to remote code execution via a crafted payload in an IP address input field.

Why it matters now

EPSS 0.76045 99th 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

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:tp-link:tl-wr840n_firmware::::::::	up to tl-wr840n\(eu\)_v5_171211	Vulnerable	TP-Link
cpe:2.3:h:tp-link:tl-wr840n:v5:::::::*	v5	Running on	TP-Link

cpe:2.3:o:tp-link:tl-wr840n_firmware:*:*:*:*:*:*:*:* Versions up to tl-wr840n\(eu\)_v5_171211 Vulnerable ·TP-Link
cpe:2.3:h:tp-link:tl-wr840n:v5:*:*:*:*:*:*:* Versions v5 Running on ·TP-Link

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-41653
2026-10-03 Alias added: GHSA-8fx7-hx38-cm88

References

Exploit 1

https://k4m1ll0.com/cve-2021-41653.html

Advisory 1

https://www.tp-link.com/us/press/security-advisory/

TI-2023-27456 Authentication bypass by spoofing in TP-Link TL-WR841N KEVCVSS 3.1MEDIUM 6.5
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
TI-2022-08819 TP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a remote code execution… 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