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CVE-2018-8238

24
FAUCET Score

CVE-2018-8238 describes a security feature bypass vulnerability in Microsoft Skype for Business and Lync, stemming from improper parsing of UNC path links in messages. With a CVSS score of 7.8 (High), this vulnerability allows an attacker to achieve high impact on confidentiality, integrity, and availability through a low-complexity attack requiring user interaction. While no public exploit code or active exploitation has been observed, the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2013CPE matchmatch criteria
cpe:2.3:a:microsoft:lync:2013:sp1:*:*:*:*:*:*
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:skype_for_business:2016:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
5.46%
Probability of exploitation in next 30 days
EPSS Percentile
91.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0546 is in the 93rd percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Skype for Business 2016 (32-bit)
View patch
microsoftpatch availablevia msrc
Product: Skype for Business 2016 (64-bit)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Lync 2013 Service Pack 1 (32-bit)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Lync 2013 Service Pack 1 (64-bit)
View patch

Vendor Advisories (1)

microsoft2018-Jul/CVE-2018-8238Important

Skype for Business and Lync Security Feature Bypass Vulnerability

Jul 10, 2018

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2018-8238
PatchVendor Advisory
securityfocus.com / bid/104619
Third Party AdvisoryVDB Entry