Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2024-04-06 18:17

Modified

2026-09-08 08:34

Summary

HTTP/2: CPU exhaustion due to CONTINUATION frame flood

Details

Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy's HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy's header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion. Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "envoy",
        "purl": "pkg:bitnami/envoy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.26.8"
            },
            {
              "introduced": "1.27.0"
            },
            {
              "fixed": "1.27.4"
            },
            {
              "introduced": "1.28.0"
            },
            {
              "fixed": "1.28.2"
            },
            {
              "introduced": "1.29.0"
            },
            {
              "fixed": "1.29.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-30255"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy\u0027s HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy\u0027s header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion. Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections.",
  "id": "BIT-envoy-2024-30255",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2024-04-06T18:17:53.965Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.openwall.com/lists/oss-security/2024/04/03/16"
    },
    {
      "type": "DISCUSSION",
      "url": "http://www.openwall.com/lists/oss-security/2024/04/05/3"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-30255"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/421644"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "HTTP/2: CPU exhaustion due to CONTINUATION frame flood"
}

CVE-2024-30255 (GCVE-0-2024-30255)

Vulnerability from cvelistv5 – Published: 2024-04-04 19:41 – Updated: 2025-11-04 18:30

Title

HTTP/2: CPU exhaustion due to CONTINUATION frame flood

Summary

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-04-08 14:58 UTC

CWE

CWE-390 - Detection of Error Condition Without Action

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/envoyproxy/envoy/security/advi…	x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2024/04/05/3
http://www.openwall.com/lists/oss-security/2024/0…
https://www.kb.cert.org/vuls/id/421644

Impacted products

2 products

Vendor	Product	Version
envoyproxy	envoy	Affected: >= 1.29.0, < 1.29.3 Affected: >= 1.28.0, < 1.28.2 Affected: >= 1.27.0, < 1.27.4 Affected: < 1.26.8
envoyproxy	envoy	Affected: 1.29.0 , < 1.29.3 (custom) Affected: 1.28.0 , < 1.28.2 (custom) Affected: 1.27.0 , < 1.27.4 (custom) Affected: 0 , < 1.26.8 (custom) cpe:2.3:a:envoyproxy:envoy::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "envoy",
            "vendor": "envoyproxy",
            "versions": [
              {
                "lessThan": "1.29.3",
                "status": "affected",
                "version": "1.29.0",
                "versionType": "custom"
              },
              {
                "lessThan": "1.28.2",
                "status": "affected",
                "version": "1.28.0",
                "versionType": "custom"
              },
              {
                "lessThan": "1.27.4",
                "status": "affected",
                "version": "1.27.0",
                "versionType": "custom"
              },
              {
                "lessThan": "1.26.8",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-30255",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-04-08T14:58:49.679014Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-07-16T13:47:51.426Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T18:30:33.889Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/04/05/3"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/04/03/16"
          },
          {
            "url": "https://www.kb.cert.org/vuls/id/421644"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "envoy",
          "vendor": "envoyproxy",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.29.0, \u003c 1.29.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.28.0, \u003c 1.28.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.27.0, \u003c 1.27.4"
            },
            {
              "status": "affected",
              "version": "\u003c 1.26.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy\u0027s HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy\u0027s header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion. Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-390",
              "description": "CWE-390: Detection of Error Condition Without Action",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-05-01T18:07:47.558Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm"
        },
        {
          "url": "http://www.openwall.com/lists/oss-security/2024/04/05/3"
        },
        {
          "url": "http://www.openwall.com/lists/oss-security/2024/04/03/16"
        }
      ],
      "source": {
        "advisory": "GHSA-j654-3ccm-vfmm",
        "discovery": "UNKNOWN"
      },
      "title": "HTTP/2: CPU exhaustion due to CONTINUATION frame flood"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-30255",
    "datePublished": "2024-04-04T19:41:02.634Z",
    "dateReserved": "2024-03-26T12:52:00.934Z",
    "dateUpdated": "2025-11-04T18:30:33.889Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2024-30255 (GCVE-0-2024-30255)

Tags

Sightings

Nomenclature

Related by attack behaviour