CVE-2019-0798
CVE-2019-0798 is a medium-severity vulnerability in Microsoft Lync Server with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v2: 4.3
- EPSS exploit prediction: 2% (79th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Microsoft Lync Server
- Published:
- Last modified:
Description
A spoofing vulnerability exists when a Lync Server or Skype for Business Server does not properly sanitize a specially crafted request, aka 'Skype for Business and Lync Spoofing Vulnerability'.
Frequently asked questions
- What is CVE-2019-0798?
- A spoofing vulnerability exists when a Lync Server or Skype for Business Server does not properly sanitize a specially crafted request, aka 'Skype for Business and Lync Spoofing Vulnerability'.
- How severe is CVE-2019-0798?
- CVE-2019-0798 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2019-0798 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-0798?
- CVE-2019-0798 primarily affects Microsoft Lync Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-0798?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-0798 published?
- CVE-2019-0798 was published on 2019-04-09 and last updated on 2026-06-17.
References
Affected products (2)
- cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:skype_for_business_server:2015:*:*:*:*:*:*:*
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- CVE-2021-26421 — Medium (CVSS 6.5): Skype for Business and Lync Spoofing Vulnerability
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