Description
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.
References (7)
Core 7
Core References
Third Party Advisory, VDB Entry vdb-entry
https://vuldb.com/?id.320359
Permissions Required, VDB Entry signature
permissions-required
https://vuldb.com/?ctiid.320359
Third Party Advisory, VDB Entry third-party-advisory
https://vuldb.com/?submit.632268
Exploit, Third Party Advisory related
https://github.com/ZZ2266/.github.io/tree/main/AC20/hardcoded%20password/readme.md
Exploit, Third Party Advisory exploit
https://github.com/ZZ2266/.github.io/blob/main/AC20/hardcoded%20password/readme.md#description
Product product
https://www.tenda.com.cn/
Exploit, Third Party Advisory
https://github.com/ZZ2266/.github.io/blob/main/AC20/hardcoded%20password/readme.md
Scores
CVSS v3
2.5
EPSS
0.0020
EPSS Percentile
10.1%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-259
CWE-798
Status
published
Products (1)
tenda/ac20_firmware
16.03.08.12
Published
Aug 17, 2025
Tracked Since
Feb 18, 2026