CVE-2021-43255
Microsoft Office Trust Center Spoofing Vulnerability
5.5 Medium
Microsoft Office Trust Center Spoofing Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
2.08%Up 1.7 points since Dec 16, 2021
What each source reports
CVE List Score used
Microsoft Office Trust Center Spoofing Vulnerability
Microsoft Office Trust Center Spoofing Vulnerability
- Record
CVE-2021-43255- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-30199
Microsoft Office Trust Center Spoofing Vulnerability
- Record
EUVD-2021-30199- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-x5f4-jxc9-j6mv
Microsoft Office Trust Center Spoofing Vulnerability
Microsoft Office Trust Center Spoofing Vulnerability
- Record
GHSA-x5f4-jxc9-j6mv- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
NVD
Microsoft Office Trust Center Spoofing Vulnerability
- Record
CVE-2021-43255- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-43255 is a medium vulnerability (CVSS 5.5) in Microsoft Office, published December 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.08%, the 81st percentile. No source names a fixed version.