What is CVE-2020-3927?

CVE-2020-3927 is a high-severity vulnerability in Changing Servisign Windows Versions, classified under Files or Directories Accessible to External Parties. CVSS score: 8.3/10. Published 2020-02-03.

How severe is CVE-2020-3927?

High severity. CVSS v3 base score is 8.3 out of 10.

Vulnerability in Changing Servisign Windows Versions

CVE-2020-3927

An arbitrary-file-access vulnerability exists in ServiSign security plugin, as long as the attackers learn the specific API function, they may access arbitrary files on target system via crafted API parameter.

Published 2020-02-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Changing Servisign Windows Versions — versions 0
Changingtec Servisign
Microsoft Windows

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

tvn.twcert.org.tw/taiwanvn/TVN-201910007 (Third Party Advisory)
www.chtsecurity.com/news/1179d48b-7609-4f67-9d7e-3bac2979c6ce (Third Party Advisory)

Frequently asked questions

What is CVE-2020-3927?: CVE-2020-3927 is a high-severity vulnerability in Changing Servisign Windows Versions, classified under Files or Directories Accessible to External Parties. CVSS score: 8.3/10. Published 2020-02-03.
How severe is CVE-2020-3927?: High severity. CVSS v3 base score is 8.3 out of 10.