Microsoft Exchange Server 2013 CU23/2016 CU22/2019 CU10 Privilege Escalation
|CVSS Meta Temp Score|
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
|Current Exploit Price (≈)|
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
|CTI Interest Score|
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A vulnerability was found in Microsoft Exchange Server 2013 CU23/2016 CU22/2019 CU10 (Groupware Software). It has been declared as very critical. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:
Microsoft Exchange Server Remote Code Execution Vulnerability
The weakness was released 10/12/2021 as confirmed security guidance (Website). The advisory is available at portal.msrc.microsoft.com. This vulnerability was named CVE-2021-26427 since 01/29/2021. The exploitation appears to be easy. The attack can be initiated remotely. Required for exploitation is a single authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 10/15/2021).
Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.
CVSSv3VulDB Meta Base Score: 9.5
VulDB Meta Temp Score: 8.2
VulDB Base Score: 9.9
VulDB Temp Score: 8.6
VulDB Vector: 🔒
VulDB Reliability: 🔍
Vendor Base Score (Microsoft): 9.0
Vendor Vector (Microsoft): 🔒
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔒
Threat IntelligenceInterest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍
Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒
Timeline01/29/2021 CVE assigned
10/12/2021 +256 days VulDB entry created
10/12/2021 +0 days Advisory disclosed
10/12/2021 +0 days Countermeasure disclosed
10/15/2021 +3 days VulDB last update
CVE: CVE-2021-26427 (🔒)
EntryCreated: 10/12/2021 08:49 PM
Updated: 10/15/2021 09:11 AM
Changes: (2) source_cve_assigned source_cve_nvd_summary
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