CVE-2021-32778

Katalog CVE

CVSS 7.5 · High EPSS 1,2%

Kerentanan Excessive Iteration pada envoyproxy envoy. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

24 Agustus 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

7.5 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-834: Excessive Iteration

EPSS (30 hari)

1,2% peluang dieksploitasi; lebih tinggi dari 68,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history release notes · advisory vendor
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc advisory pihak ketiga