Vulnerability-Lookup

FKIE_CVE-2021-39204

Vulnerability from fkie_nvd - Published: 2021-09-09 22:15 - Updated: 2026-06-17 04:03

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.

References

URL	Tags
security-advisories@github.com	https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc	Third Party Advisory
security-advisories@github.com	https://github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r	Third Party Advisory
security-advisories@github.com	https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ	Not Applicable
af854a3a-2127-422b-91ae-364da2661108	https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ	Not Applicable

Impacted products

Vendor	Product	Version
envoyproxy	envoy	*
envoyproxy	envoy	*
envoyproxy	envoy	*
envoyproxy	envoy	1.19.0
pomerium	pomerium	*
pomerium	pomerium	0.15.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "pomerium",
          "vendor": "pomerium",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.14.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 0.15.0, \u003c 0.15.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2FA474E1-2F0F-44D7-938F-40EE9DB5C230",
              "versionEndIncluding": "1.16.4",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83547329-1394-417F-93DB-70C1A9D173B0",
              "versionEndExcluding": "1.17.4",
              "versionStartIncluding": "1.17.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D7376E28-9915-4CA1-A5DB-40874D10E781",
              "versionEndExcluding": "1.18.4",
              "versionStartIncluding": "1.18.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "1968AA35-60E2-4A00-84A0-617738B55D33",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:pomerium:pomerium:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2793176B-E77A-4393-BFE5-15100D2E80FD",
              "versionEndExcluding": "0.14.8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:pomerium:pomerium:0.15.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "B0082414-BE21-4DDC-8B84-5DC9F9BAE8E3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched."
    },
    {
      "lang": "es",
      "value": "Pomerium es un proxy de acceso de c\u00f3digo abierto consciente de la identidad. Envoy, en el que es basado Pomerium, maneja inapropiadamente el restablecimiento de los flujos HTTP/2 con una complejidad excesiva. Esto puede conllevar a un alto uso de la CPU cuando es restablecido un gran n\u00famero de flujos. Esto puede resultar en una condici\u00f3n de DoS. Las versiones 0.14.8 y 0.15.1 de Pomerium contienen un binario envoy actualizado con esta vulnerabilidad parcheada"
    }
  ],
  "id": "CVE-2021-39204",
  "lastModified": "2026-06-17T04:03:18.433",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2021-09-09T22:15:09.773",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Not Applicable"
      ],
      "url": "https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Not Applicable"
      ],
      "url": "https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-834"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-834"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-39204 (GCVE-0-2021-39204)

Vulnerability from cvelistv5 – Published: 2021-09-09 22:10 – Updated: 2024-08-04 01:58

Title

Excessive CPU usage in Pomerium

Summary

Severity

7.5 (High)


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

CWE

CWE-834 - Excessive Iteration

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://groups.google.com/g/envoy-announce/c/5xBp…	x_refsource_MISC
https://github.com/envoyproxy/envoy/security/advi…	x_refsource_MISC
https://github.com/pomerium/pomerium/security/adv…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
pomerium	pomerium	Affected: < 0.14.8 Affected: >= 0.15.0, < 0.15.1

Show details on NVD website

JSON

To clipboard

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        ],
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    ],
    "cna": {
      "affected": [
        {
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          "vendor": "pomerium",
          "versions": [
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      ],
      "descriptions": [
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          "lang": "en",
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        }
      ],
      "metrics": [
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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.