VulnerabilityModified
CVE-2021-43824
In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match.
HIGH 7.5EPSS 1.06%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.06%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.06% probability · 63th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- envoyproxy/envoy
- Source
- security-advisories@github.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.