Out-of-bounds Read in TP-Link Tl-Wr841n
CVE-2026-3622
The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an out-of-bounds read, potentially causing a crash of the UPnP service. Successful exploitation can cause the UPnP service to crash, resulting in a Denial-of-Service condition. This vulnerability affects TL-WR841N v14 < EN_0.9.1 4.19 Build 260303 Rel.42399n (V14_260303) and < US_0.9.1.4.19 Build 260312 Rel. 49108n (V14_0304).
Vulnerability class: Buffer Overflow
EPSS: 0.004 (28.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Tp-link Tl-wr841n — versions 14
- Tp-link Tl-wr841n_firmware
- Tp-link Systems Inc. Tl-wr841n V14 — versions 0
Weakness classification (CWE)
References
- f23511db-6c3e-4e32-a477-6aa17d310630 (Product, patch)
- f23511db-6c3e-4e32-a477-6aa17d310630 (Product, patch)
- f23511db-6c3e-4e32-a477-6aa17d310630 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-3622?
- CVE-2026-3622 is a high-severity vulnerability in TP-Link Tl-Wr841n, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-03-26.
- How severe is CVE-2026-3622?
- High severity. CVSS v3 base score is 7.5 out of 10.