What is CVE-2021-20616?

CVE-2021-20616 is a high-severity vulnerability in Sky Co., Ltd. Skysea Client View, classified under Uncontrolled Search Path Element. CVSS score: 7.8/10. Published 2021-01-13.

How severe is CVE-2021-20616?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Sky Co., Ltd. Skysea Client View

CVE-2021-20616

Untrusted search path vulnerability in the installer of SKYSEA Client View Ver.1.020.05b to Ver.16.001.01g allows an attacker to gain privileges via a Trojan horse DLL in an unspecified directory.

Published 2021-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Sky Co., Ltd. Skysea Client View — versions Ver.1.020.05b to Ver.16.001.01g
Skygroup Skysea Client View

Weakness classification (CWE)

CWE-427 — Uncontrolled Search Path Element

References

www.skyseaclientview.net/news/210112_01/ (Vendor Advisory)
jvn.jp/en/jp/JVN69635538/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20616?: CVE-2021-20616 is a high-severity vulnerability in Sky Co., Ltd. Skysea Client View, classified under Uncontrolled Search Path Element. CVSS score: 7.8/10. Published 2021-01-13.
How severe is CVE-2021-20616?: High severity. CVSS v3 base score is 7.8 out of 10.