SB2021051176 - Input validation error in envoy
Published: May 11, 2021 Updated: August 27, 2026
Security Bulletin ID
SB2021051176
CSH Severity
Medium
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) Input validation error (CVE-ID: CVE-2021-29492)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass path matching rules.
The vulnerability exists due to improper input validation in path matching rules when handling request paths containing escaped slash characters. A remote attacker can send a specially crafted request to bypass path matching rules.
Remediation
Install update from vendor's website.