CVE-2019-1029
CVE-2019-1029 is a medium-severity vulnerability in Microsoft Lync Server with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- CVSS v2: 7.1
- EPSS exploit prediction: 5% (92nd percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Microsoft Lync Server
- Published:
- Last modified:
Description
A denial of service vulnerability exists in Skype for Business. An attacker who successfully exploited the vulnerability could cause Skype for Business to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate the attacker's user rights. To exploit the vulnerability, an attacker needs to obtain a dial-in link for a vulnerable server and then initiates a series of calls within a short amount of time. The update addresses the vulnerability by correcting the way that Skype for Business server handles objects in memory.
Frequently asked questions
- What is CVE-2019-1029?
- A denial of service vulnerability exists in Skype for Business. An attacker who successfully exploited the vulnerability could cause Skype for Business to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate the attacker's user rights. To exploit the vulnerability, an attacker needs to obtain a dial-in link for a vulnerable server and then initiates a series of calls within a short amount of time. The update addresses the vulnerability by correcting the way that Skype for Business server handles objects in memory.
- How severe is CVE-2019-1029?
- CVE-2019-1029 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2019-1029 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-1029?
- CVE-2019-1029 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-2019-1029?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-1029 published?
- CVE-2019-1029 was published on 2019-06-12 and last updated on 2026-06-17.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1029
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1029
Affected products (2)
- cpe:2.3:a:microsoft:lync_server:2010:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:*
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