Vulnerability Description
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions Envoy transitions a H/2 connection to the CLOSED state when it receives a GOAWAY frame without any streams outstanding. The connection state is transitioned to DRAINING when it receives a SETTING frame with the SETTINGS_MAX_CONCURRENT_STREAMS parameter set to 0. Receiving these two frames in the same I/O event results in abnormal termination of the Envoy process due to invalid state transition from CLOSED to DRAINING. A sequence of H/2 frames delivered by an untrusted upstream server will result in Denial of Service in the presence of untrusted **upstream** servers. Envoy versions 1.19.1, 1.18.4 contain fixes to stop processing of pending H/2 frames after connection transition to the CLOSED state.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | >= 1.18.0, < 1.18.4 |
Related Weaknesses (CWE)
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8Third Party Advisory
- https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_historyVendor Advisory
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8Third Party Advisory
- https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_historyVendor Advisory
FAQ
What is CVE-2021-32780?
CVE-2021-32780 is a vulnerability with a CVSS score of 8.6 (HIGH). Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions Envoy transitions a H/2 connection to the CLOSED state when it rec...
How severe is CVE-2021-32780?
CVE-2021-32780 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32780?
Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.