CVE-2021-26855
Scores
EPSS
Percentile: 94.3%
CVSS
CVSS Score: 9.8/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
None (N)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
High (H)
Measures the impact to the confidentiality of information
Integrity Impact
High (H)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
High (H)
Measures the impact to the availability of the impacted component
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Authentication
None (N)
Describes the level of privileges an attacker must possess
Confidentiality Impact
Partial
Measures the impact to the confidentiality of information
Integrity Impact
Partial
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
Partial
Measures the impact to the availability of the impacted component
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Scaner-VS 7 — a modern vulnerability management solution
Sources
CWEs
Related Vulnerabilities
Exploits
Exploit ID: CVE-2021-26855
Source: cisa
URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Vulnerable Software (4)
Type: Configuration
Vendor: microsoft
Product: exchange_server
Operating System: * * *
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exc...{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
}Source: nvd
Type: Windows KB
Vendor: Microsoft
Product: Windows
Operating System: Windows
Identifier: KB5000871
Source: msrc
Type: Windows KB
Vendor: Microsoft
Product: Windows
Version: 15.01.2176.014
Operating System: Windows 2176 build 14
Identifier: KB5003435
Source: msrc
Type: Windows KB
Vendor: Microsoft
Product: Windows
Version: 15.00.1497.015
Operating System: Windows 1497 build 15
Identifier: KB5001779
Source: msrc