Multiple vulnerabilities in Microsoft Excel
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-28454 CVE-2021-28451 CVE-2021-28456 |
| CWE-ID | CWE-94 CWE-200 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Microsoft Office Client/Desktop applications / Office applications Microsoft Excel Client/Desktop applications / Office applications Office Online Server Server applications / Other server solutions Microsoft Office Web Apps Server Server applications / Application servers |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Code Injection
EUVDB-ID: #VU52110
Risk: High
CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-28454
CWE-ID:
CWE-94 - Improper Control of Generation of Code ('Code Injection')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file or visit a malicious website and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMicrosoft Office: 2010 Service Pack 2 - 2019
Office Online Server: 2016
Microsoft Excel: 2010 - 2016
Microsoft Office Web Apps Server: 2013 Service Pack 1
CPE2.3- cpe:2.3:a:microsoft:microsoft_office:2010_Service_Pack_2:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:microsoft_office:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:microsoft_office:2013_RT:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:office_online_server:2016:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:microsoft_excel:*:*:*:*:*:microsoft_office:*:*
- cpe:2.3:a:microsoft:microsoft_excel:2013_RT_Service_Pack_1:*:*:*:*:microsoft_office:*:*
- cpe:2.3:a:microsoft:microsoft_office_web_apps_server:2013 Service Pack 1:*:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28454
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Code Injection
EUVDB-ID: #VU52111
Risk: High
CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2021-28451
CWE-ID:
CWE-94 - Improper Control of Generation of Code ('Code Injection')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file or visit a malicious website and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMicrosoft Office: 2019 - 2019 for Mac
Office Online Server: 2016
Microsoft Excel: 2013 - 2016
Microsoft Office Web Apps Server: 2013 Service Pack 1
CPE2.3- cpe:2.3:a:microsoft:microsoft_office:2019_for_Mac:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:office_online_server:2016:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:microsoft_excel:2013_RT_Service_Pack_1:*:*:*:*:microsoft_office:*:*
- cpe:2.3:a:microsoft:microsoft_office_web_apps_server:2013 Service Pack 1:*:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28451
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Information disclosure
EUVDB-ID: #VU52112
Risk: Medium
CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-28456
CWE-ID:
CWE-200 - Exposure of sensitive information to an unauthorized actor
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file or visit a malicious website and gain unauthorized access to sensitive information on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMicrosoft Office: 2019 - 2019 for Mac
Office Online Server: 2016
Microsoft Excel: 2010 - 2016
Microsoft Office Web Apps Server: 2013 Service Pack 1
CPE2.3- cpe:2.3:a:microsoft:microsoft_office:2019_for_Mac:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:office_online_server:2016:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:microsoft_excel:2013_RT_Service_Pack_1:*:*:*:*:microsoft_office:*:*
- cpe:2.3:a:microsoft:microsoft_office_web_apps_server:2013 Service Pack 1:*:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28456
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
