Buffer overflow in Tenda W20e
CVE-2026-90689
A security flaw has been discovered in Tenda W20E 15.11.0.61068_1546_841_CN_TDC. Impacted is the function formDelWebAuthWhiteUser. Performing a manipulation of the argument webAuthWhiteUserIndex results in stack-based buffer overflow. The attack can be initiated remotely.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Tenda W20e — versions 15.11.0.61068_1546_841_CN_TDC
Weakness classification (CWE)
References
- vuldb.com/vuln/403222 (technical-description, vdb-entry)
- vuldb.com/vuln/403222/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-90689 (third-party-advisory)
- vuldb.com/submit/914981 (third-party-advisory)
- github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/Tenda/… (related)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2026-90689?
- CVE-2026-90689 is a high-severity vulnerability in Tenda W20e, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-09-14.
- How severe is CVE-2026-90689?
- High severity. CVSS v3 base score is 8.8 out of 10.