CVE-2021-43824
Last modified
CVE-2021-43824 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.05% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | < 1.18.6 |
| Envoyproxy | Envoy | >= 1.19.0, < 1.19.3 |
| Envoyproxy | Envoy | >= 1.20.0, < 1.20.2 |
| Envoyproxy | Envoy | >= 1.21.0, < 1.21.1 |
References
- https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253aPatch, Third Party Advisory
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2pIssue Tracking, Third Party Advisory
- https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253aPatch, Third Party Advisory
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2pIssue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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