Buffer overflow in Tenda W20e
CVE-2026-24110
An issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may send overly long `addDhcpRules` data. When these rules enter the `addDhcpRule` function and are processed by `ret = sscanf(pRule, " %d\t%[^\t]\t%[^\n\r\t]", &dhcpsIndex, dhcpsIP, dhcpsMac);`, the lack of size validation for the rules could lead to buffer overflows in `dhcpsIndex`, `dhcpsIP`, and `dhcpsMac`.
Vulnerability class: Buffer Overflow
Published · last modified .
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: 0.004 (37.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Tenda W20e — versions 4.0
- Tenda W20e Firmware — versions 15.11.0.6
Weakness classification (CWE)
References
- www.tenda.com.cn/material/show/2707 (Product)
- github.com/akuma-QAQ/CVEreport/tree/main/D-link/CVE-2026-24110 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-24110?
- CVE-2026-24110 is a critical-severity vulnerability in Tenda W20e, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-03-02.
- How severe is CVE-2026-24110?
- Critical severity. CVSS v3 base score is 9.8 out of 10.