TP-Link TL-WR940N is vulnerable to a stack-based buffer overflow, caused by improper…
Priority MEDIUM 51CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- 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-787 and the CVSS impact.
Summary
TP-Link TL-WR940N is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the ipAddrDispose function. By sending specially crafted ICMP echo request packets, a remote authenticated attacker could overflow a buffer and execute arbitrary code on the system with elevated privileges.
Why it matters now
EPSS 0.11374 96th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by 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-wr940n_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | TP-Link |
| cpe:2.3:h:tp-link:tl-wr940n:-:*:*:*:*:*:*:* | not specified by NVD | Running on | TP-Link |
| cpe:2.3:o:tp-link:tl-wr941nd_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | TP-Link |
| cpe:2.3:h:tp-link:tl-wr941nd:-:*:*:*:*:*:*:* | not specified by NVD | Running on | TP-Link |
- cpe:2.3:o:tp-link:tl-wr940n_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·TP-Link
- cpe:2.3:h:tp-link:tl-wr940n:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TP-Link
- cpe:2.3:o:tp-link:tl-wr941nd_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·TP-Link
- cpe:2.3:h:tp-link:tl-wr941nd:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TP-Link
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-6989
- 2026-10-03 Alias added: GHSA-hr74-2752-vc9x
References
More TP-Link Tl-wr940n Firmware vulnerabilities
- TI-2023-16571 TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain… KEVCVSS 3.1HIGH 8.8
- TI-2023-27456 Authentication bypass by spoofing in TP-Link TL-WR841N KEVCVSS 3.1MEDIUM 6.5
- TI-2025-05561 TP-Link TL-WR940N, TL-WR841N WanSlaacCfgRpm.htm buffer overflow CVSS 4.0HIGH 8.2
- TI-2023-18224 TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart… CVSS 3.1CRITICAL 9.9
- TI-2024-36696 TP-Link TL-WR940N V3 and V4 with firmware 3.16.9 and earlier contain a buffer overflow… CVSS 3.1HIGH 8.0
- TI-2026-09847 OS Command Injection in BigPond Cable (BPA) Configuration in TP-Link TL-WR940N CVSS 4.0HIGH 8.5
Sources
- CVE-2019-6989 · CVE Program
- CVE-2019-6989 · NVD
- FIRST EPSS
- GHSA-hr74-2752-vc9x · 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