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.

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.

EPSS: 0.004 (33.2th percentile) — read the EPSS interpretation.

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.

Affected products

Trendnet Tew-827dru — versions 2.0
Trendnet Tew-827dru_firmware — versions 2.08b01
N/a Trendnet Ac2600 Tew-827dru — versions 2.08B01

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

vulnreport@tenable.com (Third Party Advisory, x_refsource_MISC)

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.