CVE-2017-8621 : Microsoft Exchange Server 2010 SP3, Exchange Server 2013 SP3, Exchange Server 20

Microsoft Exchange Server 2010 SP3, Exchange Server 2013 SP3, Exchange Server 2013 CU16, and Exchange Server 2016 CU5 allows an open redirect vulnerability that could lead to spoofing, aka "Microsoft Exchange Open Redirect Vulnerability".

Published 2017-07-11 21:29:03

Updated 2017-07-17 18:48:47

Source Microsoft Corporation

View at NVD, CVE.org

Vulnerability category: Open redirect

Products affected by CVE-2017-8621

Microsoft » Exchange Server » Version: 2010 Update SP3
cpe:2.3:a:microsoft:exchange_server:2010:sp3:*:*:*:*:*:*
Matching versions
Microsoft » Exchange Server » Version: 2013 Update SP1
cpe:2.3:a:microsoft:exchange_server:2013:sp1:*:*:*:*:*:*
Matching versions
Microsoft » Exchange Server » Version: 2013 Update Cumulative Update 16
cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_16:*:*:*:*:*:*
Matching versions
Microsoft » Exchange Server » Version: 2016 Update Cumulative Update 5
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_5:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2017-8621

Top countries where our scanners detected CVE-2017-8621

Top open port discovered on systems with this issue 10001

IPs affected by CVE-2017-8621 7,551

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2017-8621!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2017-8621

EPSS FAQ

0.92%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 74 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2017-8621

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:N	8.6	4.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2017-8621

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-8621

http://www.securityfocus.com/bid/99533

Microsoft Exchange Server CVE-2017-8621 Open Redirection Vulnerability
Third Party Advisory;VDB Entry
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8621

CVE-2017-8621 | Microsoft Exchange Open Redirect Vulnerability
Patch;Vendor Advisory
http://www.securitytracker.com/id/1038852

Microsoft Exchange Input Validation Flaws Let Remote Users Conduct Open Redirect and Cross-Site Scripting Attacks - SecurityTracker
Third Party Advisory;VDB Entry

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