CVE-2020-16904 json
Azure Functions Elevation of Privilege Vulnerability
published 2020-10-16 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-8862
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.4%
- EPSS 3.4% chance of exploitation in 30 days, percentile 88%
- public exploits
- 0
- none known
Summary
<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>
Patch / fix
Exploit prediction
3.37% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C |
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Microsoft Azure Functions
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2020-16904
patch, vendor-advisory
Sources
- CVE List CVE-2020-16904
- NVD CVE-2020-16904
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