RCE in Tenda Ac20
CVE-2025-9090
A vulnerability was identified in Tenda AC20 16.03.08.12. Affected is the function websFormDefine of the file /goform/telnet of the component Telnet Service. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.152 (96.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.141 · newest: 0.152 · change: +0.011
Affected products
- Tenda Ac20 — versions 16.03.08.12
- Tenda Ac20 Firmware — versions 16.03.08.12
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/ZZ2266/.github.io/blob/main/AC20/telnet/readme.md (related, Exploit, Third Party Advisory)
- github.com/ZZ2266/.github.io/blob/main/AC20/telnet/readme.md (Exploit, Third Party Advisory, exploit)
- www.tenda.com.cn/ (Product, product)
Frequently asked questions
- What is CVE-2025-9090?
- CVE-2025-9090 is a medium-severity vulnerability in Tenda Ac20, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2025-08-17.
- How severe is CVE-2025-9090?
- Medium severity. CVSS v3 base score is 6.3 out of 10.
- Is CVE-2025-9090 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.