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GitHub_MCVE-2021-32778

HistoryAug 24, 2021 - 9:15 p.m.

CVE-2021-32778

2021-08-2421:15:09

CWE-834

GitHub_M

web.nvd.nist.gov

envoy

l7 proxy

vulnerability

dos

denial of service

http/2

cve-2021-32778

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

AI Score

7.3

Confidence

High

EPSS

0.001

Percentile

45.6%

JSON

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.

Affected configurations

Nvd

Vulners

Node

envoyproxyenvoyRange1.16.0–1.16.5

envoyproxyenvoyRange1.17.0–1.17.4

envoyproxyenvoyRange1.18.0–1.18.4

envoyproxyenvoyMatch1.19.0

VendorProductVersionCPE
envoyproxyenvoy*cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxyenvoy*cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxyenvoy*cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxyenvoy*cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
envoyproxy	envoy	*	cpe:2.3:a:envoyproxy:envoy::::::::
envoyproxy	envoy	*	cpe:2.3:a:envoyproxy:envoy::::::::
envoyproxy	envoy	*	cpe:2.3:a:envoyproxy:envoy::::::::
envoyproxy	envoy	*	cpe:2.3:a:envoyproxy:envoy::::::::

CNA Affected

[
  {
    "product": "envoy",
    "vendor": "envoyproxy",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.19.0, < 1.19.1"
      },
      {
        "status": "affected",
        "version": ">= 1.18.0, < 1.18.4"
      },
      {
        "status": "affected",
        "version": ">= 1.17.0, < 1.17.4"
      },
      {
        "status": "affected",
        "version": ">= 1.16.0, < 1.16.5"
      }
    ]
  }
]