What is CVE-2025-9091?

CVE-2025-9091 is a low-severity vulnerability in Tenda Ac20, classified under Use of Hard-coded Password. CVSS score: 2.5/10. Published 2025-08-17.

How severe is CVE-2025-9091?

Low severity. CVSS v3 base score is 2.5 out of 10.

Is CVE-2025-9091 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Tenda Ac20

CVE-2025-9091

A security flaw has been discovered in Tenda AC20 16.03.08.12. Affected by this vulnerability is an unknown functionality of the file /etc_ro/shadow. The manipulation leads to hard-coded credentials. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used.

Published 2025-08-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (11.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

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

fkie-cad/nvd-json-data-feeds

References

vuldb.com/ (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/tree/main/AC20/hardcoded password/readme.md (related, Exploit, Third Party Advisory)
github.com/ZZ2266/.github.io/blob/main/AC20/hardcoded password/readme.md (Exploit, Third Party Advisory, exploit)
www.tenda.com.cn/ (Product, product)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-9091?: CVE-2025-9091 is a low-severity vulnerability in Tenda Ac20, classified under Use of Hard-coded Password. CVSS score: 2.5/10. Published 2025-08-17.
How severe is CVE-2025-9091?: Low severity. CVSS v3 base score is 2.5 out of 10.
Is CVE-2025-9091 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.