Microsoft Exchange Server 2013 CU23/2016 CU22/2019 CU10 Privilege Escalation

EntryeditHistoryDiffjsonxmlCTI
CVSS Meta Temp Score
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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
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.2$5k-$25k0.53

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.

Productinfoedit

Type

Vendor

Name

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB 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): 🔒

CVSSv2infoedit

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Unknown
CWE: Unknown
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Unproven
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒

Patch: portal.msrc.microsoft.com

Timelineinfoedit

01/29/2021 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

Sourcesinfoedit

Vendor: https://www.microsoft.com/

Advisory: portal.msrc.microsoft.com
Status: Confirmed

CVE: CVE-2021-26427 (🔒)

Entryinfoedit

Created: 10/12/2021 08:49 PM
Updated: 10/15/2021 09:11 AM
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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