THREATPORT/VULNERABILITY/CVE-2021-41163
CRITICAL SEVERITY

CVE-2021-41163

Discourse vulnerability

CVSS
10.0
EPSS
19.8%
EPSS pct
97th
Exploited
No known
Discourse is an open source platform for community discussion. In affected versions maliciously crafted requests could lead to remote code execution. This resulted from a lack of validation in subscribe_url values. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. To workaround the issue without updating, requests with a path starting /webhooks/aws path could be blocked at an upstream proxy.
Affected vendor
Discourse
Affected product
Discourse
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness type (CWE)
Published
2021-10-20

Risk analysis

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

Its EPSS score of 19.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2021-41163

  • Confirm whether Discourse Discourse is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-41163.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-41163

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-41163 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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