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CVE-2019-0798

22
FAUCET Score

CVE-2019-0798 is a spoofing vulnerability affecting Microsoft Lync Server and Skype for Business Server, stemming from improper sanitization of specially crafted requests. With a CVSS score of 6.1 (Medium), it can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading to limited confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or inclusion in the KEV catalog. Community discussion and media coverage are minimal, indicating low current attention.

Impacted Technologies

VendorProductVersion(s)CPE
2013CPE matchmatch criteria
cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:*
2015CPE matchmatch criteria
cpe:2.3:a:microsoft:skype_for_business_server:2015:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.08%
Probability of exploitation in next 30 days
EPSS Percentile
79.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0208 is in the 90th percentile among its peer group of 26,209 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Skype for Business Server 2015 March 2019 Update
View patch
microsoftpatch availablevia msrc
Product: Microsoft Lync Server 2013 July 2018 Update
View patch

Vendor Advisories (1)

microsoft2019-Mar/CVE-2019-0798Important

Skype for Business and Lync Spoofing Vulnerability

Mar 12, 2019

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2019-0798
PatchVendor Advisory