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CVE-2021-32778 (GCVE-0-2021-32778)

Vulnerability from cvelistv5 – Published: 2021-08-24 20:30 – Updated: 2024-08-03 23:33
VLAI
Title
Excessive CPU utilization when closing HTTP/2 streams
Summary
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.
Severity
5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
envoyproxy envoy Affected: >= 1.19.0, < 1.19.1
Affected: >= 1.18.0, < 1.18.4
Affected: >= 1.17.0, < 1.17.4
Affected: >= 1.16.0, < 1.16.5
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      "id": "CVE-2021-32778",
      "initial_release_date": "2021-08-24T19:00:00+00:00",
      "product_status:fixed": "43",
      "product_status:known_affected": "4",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "envoyproxy/envoy: excessive CPU usage when handling a large number of HTTP/2 requests",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-32778.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2025-12-19T02:01:22Z",
      "cve": "CVE-2021-32778",
      "id": "CVE-2021-32778",
      "initial_release_date": "2024-06-04T12:57:27Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-32778",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-32778.json",
      "version": "7"
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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