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CVE-2018-8311

35
FAUCET Score

CVE-2018-8311 describes a remote code execution vulnerability in Microsoft Skype for Business and Lync clients. This flaw allows an attacker to execute arbitrary code on a victim's system by sending specially crafted content that the client fails to properly sanitize. With a CVSS score of 8.8 (High), this vulnerability presents a significant risk, requiring user interaction but offering high impact to confidentiality, integrity, and availability. While no public exploit code or active exploitation has been confirmed, its high FAUCET Risk Score and notable community discussion indicate its potential severity.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:lync:-:sp1:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:skype_for_business:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
16.62%
Probability of exploitation in next 30 days
EPSS Percentile
96.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1662 is in the 97th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 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 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

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
microsoftvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

microsoft2018-Jul/CVE-2018-8311Important

Remote Code Execution Vulnerability in Skype For Business and Lync

Jul 10, 2018

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2018-8311
Vendor Advisory
securityfocus.com / bid/104624
Third Party AdvisoryVDB Entry
securitytracker.com / id/1041259
Third Party AdvisoryVDB Entry
securitytracker.com / id/1041260
Third Party AdvisoryVDB Entry