CVE-2012-1849

Untrusted search path vulnerability in Microsoft Lync 2010, 2010 Attendee, and 2010 Attendant allows local users to gain privileges via a Trojan horse DLL in the current working directory, as demonstrated by a directory that contains a .ocsmeet file, aka "Lync Insecure Library Loading Vulnerability."

Published: 2012-06-12 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]

Conclusion & alert: CVE-2012-1849 is rated High Risk (66.4/100): CVSS Critical severity, with high exploitation likelihood (EPSS 49.99%, 98th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-1849

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-11 59.14% 49.99% -9.14%
2 2025-03-30 67.09% 59.14% -7.95%
3 2025-03-29 67.09%

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-1849

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
8.6 10.0 [email protected]

Weakness enumeration for CVE-2012-1849

NVD evaluator notes for CVE-2012-1849

Impact: Per: http://technet.microsoft.com/en-us/security/bulletin/ms12-039 AV:N per "How could an attacker exploit the vulnerability? An attacker could convince a user to open a legitimate Microsoft Lync related file (such as an .ocsmeet file) that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the legitimate file, Microsoft Lync could attempt to load the DLL file and execute any code it contained. In an email attack scenario, an attacker could exploit the vulnerability by sending a legitimate Microsoft Lync-related file (such as an .ocsmeet file) to a user, and convincing the user to place the attachment into a directory that contains a specially crafted DLL file and to open the legitimate file. Then, while opening the legitimate file, Microsoft Lync could attempt to load the DLL file and execute any code it contained. In a network attack scenario, an attacker could place a legitimate Microsoft Lync-related file and a specially crafted DLL in a network share, a UNC, or WebDAV location and then convince the user to open the file."

Comment: Per: http://cwe.mitre.org/data/definitions/426.html 'CWE-426: Untrusted Search Path'

Affected software / configurations for CVE-2012-1849

Vendor Product Version Raw CPE
microsoft lync 2010 cpe:2.3:a:microsoft:lync:2010:*:attendant_x64:*:*:*:*:*
microsoft lync 2010 cpe:2.3:a:microsoft:lync:2010:*:attendant_x86:*:*:*:*:*
microsoft lync 2010 cpe:2.3:a:microsoft:lync:2010:*:attendee:*:*:*:*:*
microsoft lync 2010 cpe:2.3:a:microsoft:lync:2010:*:x64:*:*:*:*:*
microsoft lync 2010 cpe:2.3:a:microsoft:lync:2010:*:x86:*:*:*:*:*

References for CVE-2012-1849

cvelogic Threat Intelligence