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ExploitedNot in CISA KEV yet

CVE-2021-41653

Exploitation confirmed. First attested on 2023-10-14 by GCVE · kevintel, GCVE · shadowserver.

  • Published2021-11-13
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

dates in UTC
  1. 2021-11-1315:15CVE publishedNVD
  2. 2023-10-1417:42Listed as exploited by GCVEGCVE
  3. 2023-10-1417:42Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-41653?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-41653?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Tp-link tl-wr840n firmwareversion to verify
BranchAffectedFixed in
—≤ tl-wr840n\(eu\)_v5_171211no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedlikeww/CVE-2021-41653
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-11-13
Last Modified
2026-07-09
NVD status
Modified
GitHub Advisory
GHSA-8fx7-hx38-cm88

Frequently asked questions

What is CVE-2021-41653?

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.

Is CVE-2021-41653 actively exploited?

Active exploitation of CVE-2021-41653 has not been confirmed. Its EPSS score was 76.0% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41653?

CVE-2021-41653 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record