CHANGING Inc. TSSServiSignAdapter Windows Versions - Improper Input Validation
Priority MEDIUM 46CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.02007 80th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| CHANGING | TSSServiSignAdapter | up to 1.0.20.0316 | — | No fix listed | CNA |
- TSSServiSignAdapter VendorCHANGING Affected up to 1.0.20.0316 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:tssservisignadapter_project:tssservisignadapter:*:*:*:*:*:windows:*:* | up to 1.0.20.0316 | Vulnerable | Tssservisignadapter Project |
- cpe:2.3:a:tssservisignadapter_project:tssservisignadapter:*:*:*:*:*:windows:*:* Versions up to 1.0.20.0316 Vulnerable ·Tssservisignadapter Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-37909
- 2026-10-03 Alias added: GHSA-7wg8-6xc4-8gfw
References
More CHANGING vulnerabilities
- TI-2022-18452 ChangingTec MegaServiSignAdapter - Improper Input Validation CVSS 3.1CRITICAL 9.8
- TI-2022-18448 Changing Information Technology Inc. RAVA certificate validation system - SQL Injection CVSS 3.1CRITICAL 9.8
- TI-2026-02589 Changing｜IDExpert Windows Logon Agent - Remote Code Execution CVSS 4.0CRITICAL 9.3
- TI-2026-02588 Changing｜IDExpert Windows Logon Agent - Remote Code Execution CVSS 4.0CRITICAL 9.3
- TI-2020-15835 CHANGING Inc. NHIServiSignAdapter Windows Versions - Stack Overflow CVSS 3.1CRITICAL 9.8
- TI-2020-15834 CHANGING Inc. NHIServiSignAdapter Windows Versions - Heap Overflow CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-37909 · CVE Program
- CVE-2021-37909 · NVD
- FIRST EPSS
- GHSA-7wg8-6xc4-8gfw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences