What is CVE-2023-39747?

CVE-2023-39747 is a critical-severity vulnerability in TP-Link Tl-Wr841n V8, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-08-21.

How severe is CVE-2023-39747?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in TP-Link Tl-Wr841n V8

CVE-2023-39747

TP-Link WR841N V8, TP-Link TL-WR940N V2, and TL-WR941ND V5 were discovered to contain a buffer overflow via the radiusSecret parameter at /userRpm/WlanSecurityRpm.

Vulnerability class: Buffer Overflow

Published 2023-08-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.087 (95.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.087 · newest: 0.087 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/a101e-IoTvul/iotvul/blob/main/tp-link/17/TP-Link WR841N wireless rou… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-39747?: CVE-2023-39747 is a critical-severity vulnerability in TP-Link Tl-Wr841n V8, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-08-21.
How severe is CVE-2023-39747?: Critical severity. CVSS v3 base score is 9.8 out of 10.