Vulnerability in Trendnet Tew-827dru
CVE-2021-20156
Trendnet AC2600 TEW-827DRU version 2.08B01 contains an improper access control configuration that could allow for a malicious firmware update. It is possible to manually install firmware that may be malicious in nature as there does not appear to be any signature validation done to determine if it is from a known and trusted source. This includes firmware updates that are done via the automated "check for updates" in the admin interface. If an attacker is able to masquerade as the update server, the device will not verify that the firmware updates downloaded are legitimate.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.3% 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
- Trendnet Tew-827dru — versions 2.0
- Trendnet Tew-827dru Firmware — versions 2.08b01
- Trendnet Ac2600 Tew-827dru — versions 2.08B01
Weakness classification (CWE)
References
- www.tenable.com/security/research/tra-2021-54 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20156?
- CVE-2021-20156 is a medium-severity vulnerability in Trendnet Tew-827dru, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.5/10. Published 2021-12-30.
- How severe is CVE-2021-20156?
- Medium severity. CVSS v3 base score is 6.5 out of 10.