CVE-2021-32778
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- CVE-2021-32778
CVE Details
| Release Date: | 2021-08-24 |
Description
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy's procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.
See more information about CVE-2021-32778 from MITRE CVE dictionary and NIST NVD
CVSS v3.0 metrics
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
| Base Score: | 7.5 | Base Metrics: | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Access Vector: | Network | Attack Complexity: | Low |
| Privileges Required: | None | User Interaction: | None |
| Scope: | Unchanged | Confidentiality Impact: | None |
| Integrity Impact: | None | Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 7 (istio) | ELSA-2021-9525 | 2021-11-10 |
| Oracle Linux version 7 (istio) | ELSA-2021-9526 | 2021-11-09 |
| Oracle Linux version 7 (kubernetes) | ELSA-2021-9526 | 2021-11-09 |
| Oracle Linux version 7 (olcne) | ELSA-2021-9525 | 2021-11-10 |
| Oracle Linux version 7 (olcne) | ELSA-2021-9526 | 2021-11-09 |
| Oracle Linux version 8 (istio) | ELSA-2021-9525 | 2021-11-10 |
| Oracle Linux version 8 (istio) | ELSA-2021-9546 | 2021-11-09 |
| Oracle Linux version 8 (kubernetes) | ELSA-2021-9546 | 2021-11-09 |
| Oracle Linux version 8 (olcne) | ELSA-2021-9525 | 2021-11-10 |
| Oracle Linux version 8 (olcne) | ELSA-2021-9546 | 2021-11-09 |
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