CVE•Published 2021-11-13•Modified 2026-07-09•1 article on news•6 live references•NVD data
CVE-2021-41653Tp-link · Tl-wr840n_firmware
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
100
Exploit Prediction Scoring System · top 0% of all CVEs
Weaknesses (CWE)
Description
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.
Timeline
Published 2021-11-13
Modified 2026-07-09
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2021-41653Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · OS
os:"Tl-wr840n Firmware"Hosts Shodan identified as running Tl-wr840n Firmware.
More intel sources (5)
Shodan report
vuln:CVE-2021-41653Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-41653Censys host search filtered to this CVE id.
grep.app
CVE-2021-41653Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-41653GitHub code search for direct mentions.
Google dork
"CVE-2021-41653" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.