SB2021030980 - Improper access control in envoy
Published: March 9, 2021 Updated: August 27, 2026
Security Bulletin ID
SB2021030980
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2021-21378)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper access control in JWT authentication when validating tokens with an unknown issuer. A remote attacker can present a token with an unknown issuer to disclose sensitive information.
Remediation
Install update from vendor's website.