Auth bypass in Envoyproxy Envoy
CVE-2021-21378
Envoy is a cloud-native high-performance edge/middle/service proxy. In Envoy version 1.17.0 an attacker can bypass authentication by presenting a JWT token with an issuer that is not in the provider list when Envoy's JWT Authentication fil…
Vulnerability class: Broken Authentication
EPSS: 0.017 (74.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Envoyproxy Envoy — versions 1.17.0, = 1.17.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory, Mitigation)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-21378?
- CVE-2021-21378 is a high-severity vulnerability in Envoyproxy Envoy, classified under Improper Authentication. CVSS score: 8.2/10. Published 2021-03-11.
- How severe is CVE-2021-21378?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2021-21378 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.