THREATPORT/VULNERABILITY/CVE-2020-16873
MEDIUM SEVERITY

CVE-2020-16873

Xamarin.Forms vulnerability

CVSS
4.7
EPSS
4.0%
EPSS pct
89th
Exploited
No known
<p>A spoofing vulnerability manifests in Microsoft Xamarin.Forms due to the default settings on Android WebView version prior to 83.0.4103.106. This vulnerability could allow an attacker to execute arbitrary Javascript code on a target system.</p> <p>For the attack to be successful, the targeted user would need to browse to a malicious website or a website serving the malicious code through Xamarin.Forms.</p> <p>The security update addresses this vulnerability by preventing the malicious Javascript from running in the WebView.</p>
Affected vendor
Microsoft
Affected product
Xamarin.Forms
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Weakness type (CWE)
  • CWE-1188 — Insecure Default Initialization of Resource
Published
2020-09-11

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to low impact to confidentiality.

Its EPSS score of 4.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2020-16873

  • Confirm whether Microsoft Xamarin.Forms is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-16873.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-16873

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-16873 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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