CVE-2021-41653: tp-link tl-wr840n_firmware Code Injection
CVSS: 10.0v2.0HighModified
Published 13-11-2021Last modified 09-07-2026
Vulnerability summary
CVE-2021-41653 is a high (CVSS 10.0) Code Injection vulnerability in tp-link tl-wr840n_firmware. EPSS estimates a 76.05% chance of exploitation in the next 30 days, higher than 99.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
10.0/10
010
High · v2.0 (NVD)EPSS score
76.05%
0%100%
Critical · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 13-11-2021PublishedVulnerability first disclosed.
- 09-07-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 1 source · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesSingle source
High 10.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
76.05%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
0.00 pp
From 76.05% on 21-09-2026
21-09-202621-10-2026
EPSS score76.05%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (k4m1ll0.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Tp-link1 product
- tl-wr840n_firmware≤ tl-wr840n\(eu\)_v5_171211
1 vendor · 1 product
References
2 links- www.tp-link.com/us/press/security-advisory/Vendor Advisory