CVE-2021-43824

Null pointer dereference in envoy

Published Feb 22, 2022 CVSS 3.1 · 7.5 High EPSS 1.1% KEV · Not listed
Description
Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2021-30704 Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Apr 23, 2025, 7:01 PM
Reserved
Nov 16, 2021, 12:00 AM
Status
Modified
Published
Feb 22, 2022, 11:15 PM
Modified
Jun 17, 2026, 4:11 AM
Severity
Moderate
Public date
Feb 22, 2022, 7:00 AM