THREATPORT/VULNERABILITY/CVE-2020-16904
MEDIUM SEVERITY

CVE-2020-16904

Azure Functions vulnerability

CVSS
5.3
EPSS
3.4%
EPSS pct
88th
Exploited
No known
<p>An elevation of privilege vulnerability exists in the way Azure Functions validate access keys.</p> <p>An unauthenticated attacker who successfully exploited this vulnerability could invoke an HTTP Function without proper authorization.</p> <p>This security update addresses the vulnerability by correctly validating access keys used to access HTTP Functions.</p>
Affected vendor
Microsoft
Affected product
Azure Functions
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness type (CWE)
  • CWE-863 — Incorrect Authorization
Published
2020-10-16

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 low impact to confidentiality.

Its EPSS score of 3.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2020-16904

  • Confirm whether Microsoft Azure Functions is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-16904.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-16904

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-16904 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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