What is CVE-2021-20153?

CVE-2021-20153 is a medium-severity vulnerability in Trendnet Tew-827dru, classified under Improper Link Resolution Before File Access. CVSS score: 6.8/10. Published 2021-12-30.

How severe is CVE-2021-20153?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Trendnet Tew-827dru

CVE-2021-20153

Trendnet AC2600 TEW-827DRU version 2.08B01 contains a symlink vulnerability in the bittorrent functionality. If enabled, the bittorrent functionality is vulnerable to a symlink attack that could lead to remote code execution on the device. If an end user inserts a flash drive with a malicious symlink on it that the bittorrent client can write downloads to, then a user is able to download arbitrary files to any desired location on the devices filesystem, which could lead to remote code execution. Example directories vulnerable to this include "config", "downloads", and "torrents", though it should be noted that "downloads" is the only vector that allows for arbitrary files to be downloaded to arbitrary locations.

EPSS: 0.010 (57.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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-59 — Improper Link Resolution Before File Access

References

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

Frequently asked questions

What is CVE-2021-20153?: CVE-2021-20153 is a medium-severity vulnerability in Trendnet Tew-827dru, classified under Improper Link Resolution Before File Access. CVSS score: 6.8/10. Published 2021-12-30.
How severe is CVE-2021-20153?: Medium severity. CVSS v3 base score is 6.8 out of 10.