What is CVE-2021-37909?

CVE-2021-37909 is a critical-severity vulnerability in Changing Inc. Tssservisignadapter, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-09-15.

How severe is CVE-2021-37909?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Changing Inc. Tssservisignadapter

CVE-2021-37909

WriteRegistry function in TSSServiSign component does not filter and verify users’ input, remote attackers can rewrite to the registry without permissions thus perform hijack attacks to execute arbitrary code.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-09-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.2th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Changing Inc. Tssservisignadapter — versions unspecified
Tssservisignadapter Project

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.twcert.org.tw/tw/cp-132-5093-76f04-1.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-37909?: CVE-2021-37909 is a critical-severity vulnerability in Changing Inc. Tssservisignadapter, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-09-15.
How severe is CVE-2021-37909?: Critical severity. CVSS v3 base score is 9.8 out of 10.