Auth bypass in Envoyproxy Envoy
CVE-2021-39206
Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, contains two authorization related vulnerabilities CVE-2021-32777 and CVE-2021-32779. This may lead to incorrect routing or authorization policy decisions. With specially crafted requests, incorrect authorization or routing decisions may be made by Pomerium. Pomerium v0.14.8 and v0.15.1 contain an upgraded envoy binary with these vulnerabilities patched. This issue can only be triggered when using path prefix based policy. Removing any such policies should provide mitigation.
Vulnerability class: Broken Access Control
EPSS: 0.015 (71.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Envoyproxy Envoy — versions 1.19.0
- Pomerium — versions 0.15.0, >= 0.15.0, < 0.15.1, >= 0.11.0, < 0.14.8
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Not Applicable)
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39206?
- CVE-2021-39206 is a high-severity vulnerability in Envoyproxy Envoy, classified under Incorrect Authorization. CVSS score: 8.6/10. Published 2021-09-09.
- How severe is CVE-2021-39206?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2021-39206 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.