CVE-2020-3126
CVE-2020-3126 is a low-severity vulnerability in Cisco Webex Meetings Server with a CVSS 3.x base score of 3.0. 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-20.
Key facts
- Severity: Low (CVSS 3.x base score 3.0)
- CVSS v2: 3.5
- EPSS exploit prediction: 1% (54th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-20
- Affected product: Cisco Webex Meetings Server
- Published:
- Last modified:
Description
vulnerability within the Multimedia Viewer feature of Cisco Webex Meetings could allow an authenticated, remote attacker to bypass security protections. The vulnerability is due to missing security warning dialog boxes when a room host views shared multimedia files. An authenticated, remote attacker could exploit this vulnerability by using the host role to share files within the Multimedia sharing feature and convincing a former room host to view that file. A warning dialog normally appears cautioning users before the file is displayed; however, the former host would not see that warning dialog, and any shared multimedia would be rendered within the user's browser. The attacker could leverage this behavior to conduct additional attacks by including malicious files within a targeted room host's browser window.
Frequently asked questions
- What is CVE-2020-3126?
- vulnerability within the Multimedia Viewer feature of Cisco Webex Meetings could allow an authenticated, remote attacker to bypass security protections. The vulnerability is due to missing security warning dialog boxes when a room host views shared multimedia files. An authenticated, remote attacker could exploit this vulnerability by using the host role to share files within the Multimedia sharing feature and convincing a former room host to view that file. A warning dialog normally appears cautioning users before the file is displayed; however, the former host would not see that warning dialog, and any shared multimedia would be rendered within the user's browser. The attacker could leverage this behavior to conduct additional attacks by including malicious files within a targeted room host's browser window.
- How severe is CVE-2020-3126?
- CVE-2020-3126 has a CVSS 3.x base score of 3.0, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2020-3126 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-3126?
- CVE-2020-3126 affects Cisco Webex Meetings Server. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-3126?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2020-3126 published?
- CVE-2020-3126 was published on 2020-04-13 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:cisco:webex_meetings_server:t39.3:*:*:*:*:*:*:*
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