Priority reviewCritical

CVE-2021-41653

tl-wr840n firmware, tl-wr840n

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.

CVSS
9.8
EPSS
75.9%
99.5% percentile
CISA KEV
Not listed
Published
2021.11.14
PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV
Exploit probability75.9%
Technical severityCVSS 9.8

Vulnerability overview

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.

Affected product and versions

Product
tl-wr840n firmware, tl-wr840n
Affected versions
<= tl-wr840n\(eu\)_v5_171211
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that tl-wr840n firmware, tl-wr840n and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-94
CVE-2021-41653 — tl-wr840n firmware, tl-wr840n | SECUFOCUS NOW