An issue was discovered on TP-Link TL-WR840N v5 00000005 0.9.1 3.16 v0001.0 Build 170608…
Priority HIGH 79CWE-384Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-384.
Summary
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.
Why it matters now
EPSS 0.67061 99th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:tp-link:tl-wr840n_firmware:0.9.1_3.16:*:*:*:*:*:*:* | 0.9.1_3.16 | Vulnerable | TP-Link |
| cpe:2.3:h:tp-link:tl-wr840n:5.0:*:*:*:*:*:*:* | 5.0 | Running on | TP-Link |
| cpe:2.3:o:tp-link:tl-wr841n_firmware:0.9.1_4.16:*:*:*:*:*:*:* | 0.9.1_4.16 | Vulnerable | TP-Link |
| cpe:2.3:h:tp-link:tl-wr841n:13.0:*:*:*:*:*:*:* | 13.0 | Running on | TP-Link |
- cpe:2.3:o:tp-link:tl-wr840n_firmware:0.9.1_3.16:*:*:*:*:*:*:* Versions 0.9.1_3.16 Vulnerable ·TP-Link
- cpe:2.3:h:tp-link:tl-wr840n:5.0:*:*:*:*:*:*:* Versions 5.0 Running on ·TP-Link
- cpe:2.3:o:tp-link:tl-wr841n_firmware:0.9.1_4.16:*:*:*:*:*:*:* Versions 0.9.1_4.16 Vulnerable ·TP-Link
- cpe:2.3:h:tp-link:tl-wr841n:13.0:*:*:*:*:*:*:* Versions 13.0 Running on ·TP-Link
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-11714
- 2026-10-03 Alias added: GHSA-cc78-5w3j-x6q8
References
More TP-Link Tl-wr840n Firmware vulnerabilities
- TI-2023-27456 Authentication bypass by spoofing in TP-Link TL-WR841N KEVCVSS 3.1MEDIUM 6.5
- TI-2021-18357 The PING function on the TP-Link TL-WR840N EU v5 router with firmware through… CVSS 3.1CRITICAL 9.8
- TI-2022-08817 TP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
- TI-2026-02790 Authenticated Command Injection on TP-Link TL-WR802N, TL-WR841N and TL-WR840N CVSS 4.0HIGH 8.5
- TI-2022-08816 TP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
- TI-2022-08819 TP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a remote code execution… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2018-11714 · CVE Program
- CVE-2018-11714 · NVD
- FIRST EPSS
- GHSA-cc78-5w3j-x6q8 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences