CVE-2020-17143
CVE-2020-17143 is a high-severity vulnerability in Microsoft Exchange Server with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 71% places it in the 99th percentile, indicating an elevated likelihood of exploitation.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- CVSS v2: 6.5
- EPSS exploit prediction: 71% (99th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Microsoft Exchange Server
- Published:
- Last modified:
Description
Microsoft Exchange Server Information Disclosure Vulnerability
Frequently asked questions
- What is CVE-2020-17143?
- Microsoft Exchange Server Information Disclosure Vulnerability
- How severe is CVE-2020-17143?
- CVE-2020-17143 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-17143 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 71% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-17143?
- CVE-2020-17143 primarily affects Microsoft Exchange Server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-17143?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-17143 published?
- CVE-2020-17143 was published on 2020-12-10 and last updated on 2026-06-17.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17143
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17143
Affected products (5)
- cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*
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