CVE-2020-17091
CVE-2020-17091 is a high-severity vulnerability in Microsoft Teams with a CVSS 3.x base score of 7.8. 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-94.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 4.4
- EPSS exploit prediction: 2% (76th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-94
- Affected product: Microsoft Teams
- Published:
- Last modified:
Description
Microsoft Teams Remote Code Execution Vulnerability
Frequently asked questions
- What is CVE-2020-17091?
- Microsoft Teams Remote Code Execution Vulnerability
- How severe is CVE-2020-17091?
- CVE-2020-17091 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-17091 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-17091?
- CVE-2020-17091 affects Microsoft Teams. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-17091?
- 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-2020-17091 published?
- CVE-2020-17091 was published on 2020-11-11 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:teams:-:*:*:*:*:*:*:*
More vulnerabilities in Microsoft Teams
- CVE-2026-33823 — Critical (CVSS 9.6): Improper authorization in Microsoft Teams allows an authorized attacker to disclose information over a network.
- CVE-2023-4863 — High (CVSS 8.8): Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to…
- CVE-2023-29330 — High (CVSS 8.8): Microsoft Teams Remote Code Execution Vulnerability
- CVE-2023-29328 — High (CVSS 8.8): Microsoft Teams Remote Code Execution Vulnerability
- CVE-2026-21535 — High (CVSS 8.2): Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
- CVE-2026-42835 — High (CVSS 8.1): Improper neutralization of special elements in output used by a downstream component ('injection') in Microsoft Teams…
All CVEs affecting Microsoft Teams →
Other CWE-94 (Code Injection) vulnerabilities
- CVE-2026-57624 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Blocksy Companion Pro <= 2.1.46 versions.
- CVE-2026-10134 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read…
- CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
- CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
- CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
- CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.