CVE-2018-11714
CriticalExploitedAn issue was discovered on TP-Link TL-WR840N v5 00000005 0.9.1 3.16 v0001.0 Build 170608 Rel.58696n and TL-WR841N v13 00000013 0.9.1 4.16 v0001.0 Build 170622 Rel.64334n devices.
Published Jun 4, 2018 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2018-11714 is a critical-severity vulnerability (CVSS 9.8 v3) affecting Tl-Wr840n Firmware (Tp-Link), Tl-Wr841n Firmware (Tp-Link).
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 9, 2025. No public exploit code is known.
- EPSS estimates a 67% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
67%
Higher than 99.2% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
Get the full CVE-2018-11714 brief as a PDF
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Description
An issue was discovered on TP-Link TL-WR840N v5 00000005 0.9.1 3.16 v0001.0 Build 170608 Rel.58696n and TL-WR841N v13 00000013 0.9.1 4.16 v0001.0 Build 170622 Rel.64334n devices. This issue is caused by improper session handling on the /cgi/ folder or a /cgi file. If an attacker sends a header of "Referer: http://192.168.0.1/mainFrame.htm" then no authentication is required for any action.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 9, 2025 | n/a | Not reported |
| CIRCL KEV | Jan 25, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Tl-Wr840n FirmwareTp-Link | 0.9.1_3.16 | n/a |
| Tl-Wr841n FirmwareTp-Link | 0.9.1_4.16 | n/a |
Timeline
Publicly disclosed
Jun 4, 2018
Last updated
Nov 21, 2024
Added to Industry KEV feed
Oct 9, 2025
Added to CIRCL KEV
Jan 25, 2026
Weakness Type
- CWE-384 Session Fixation
References
- exploithttp://blog.securelayer7.net/time-to-disable-tp-link-home-wifi-router/
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
An issue was discovered on TP-Link TL-WR840N v5 00000005 0.9.1 3.16 v0001.0 Build 170608 Rel.58696n and TL-WR841N v13 00000013 0.9.1 4.16 v0001.0 Build 170622 Rel.64334n devices.
Affected: Tl-Wr840n Firmware (Tp-Link) versions 0.9.1_3.16; Tl-Wr841n Firmware (Tp-Link) versions 0.9.1_4.16. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 9, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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