Common Weakness Enumeration

CWE-400

Discouraged

Uncontrolled Resource Consumption

Abstraction: Class · Status: Draft

The product does not properly control the allocation and maintenance of a limited resource.

5435 vulnerabilities reference this CWE, most recent first.

GHSA-MJ4R-RR6H-Q62G

Vulnerability from github – Published: 2025-04-10 15:31 – Updated: 2025-04-14 15:31
VLAI
Details

An issue in sqlite v.3.49.0 allows an attacker to cause a denial of service via the SQLITE_DBCONFIG_LOOKASIDE component

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-29088"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190",
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-10T14:15:27Z",
    "severity": "HIGH"
  },
  "details": "An issue in sqlite v.3.49.0 allows an attacker to cause a denial of service via the SQLITE_DBCONFIG_LOOKASIDE component",
  "id": "GHSA-mj4r-rr6h-q62g",
  "modified": "2025-04-14T15:31:56Z",
  "published": "2025-04-10T15:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-29088"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sqlite/sqlite/commit/56d2fd008b108109f489339f5fd55212bb50afd4"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/ylwango613/d3883fb9f6ba8a78086356779ce88248"
    },
    {
      "type": "WEB",
      "url": "https://sqlite.org/forum/forumpost/48f365daec"
    },
    {
      "type": "WEB",
      "url": "https://sqlite.org/releaselog/3_49_1.html"
    },
    {
      "type": "WEB",
      "url": "https://www.sqlite.org/cves.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MJ6P-JGGH-HR8W

Vulnerability from github – Published: 2024-01-17 00:30 – Updated: 2025-06-20 21:31
VLAI
Details

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.35 and prior and 8.2.0 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-20961"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-01-16T22:15:43Z",
    "severity": "MODERATE"
  },
  "details": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).  Supported versions that are affected are 8.0.35 and prior and  8.2.0 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).",
  "id": "GHSA-mj6p-jggh-hr8w",
  "modified": "2025-06-20T21:31:42Z",
  "published": "2024-01-17T00:30:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-20961"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240201-0003"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujan2024.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MJ87-HWQH-73PJ

Vulnerability from github – Published: 2026-04-15 19:45 – Updated: 2026-04-24 20:51
VLAI
Summary
python-multipart affected by Denial of Service via large multipart preamble or epilogue data
Details

Summary

A denial of service vulnerability exists when parsing crafted multipart/form-data requests with large preamble or epilogue sections.

Details

Two inefficient multipart parsing paths could be abused with attacker-controlled input.

Before the first multipart boundary, the parser handled leading CR and LF bytes inefficiently while searching for the start of the first part. After the closing boundary, the parser continued processing trailing epilogue data instead of discarding it immediately. As a result, parsing time could grow with the size of crafted data placed before the first boundary or after the closing boundary.

Impact

An attacker can send oversized malformed multipart bodies that consume excessive CPU time during request parsing, reducing request-handling capacity and delaying legitimate requests. This issue degrades availability but does not typically result in a complete denial of service for the entire application.

Mitigation

Upgrade to version 0.0.26 or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "python-multipart"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.26"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40347"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-834"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-15T19:45:44Z",
    "nvd_published_at": "2026-04-18T00:16:38Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nA denial of service vulnerability exists when parsing crafted `multipart/form-data` requests with large preamble or epilogue sections.\n\n### Details\n\nTwo inefficient multipart parsing paths could be abused with attacker-controlled input.\n\nBefore the first multipart boundary, the parser handled leading CR and LF bytes inefficiently while searching for the start of the first part. After the closing boundary, the parser continued processing trailing epilogue data instead of discarding it immediately. As a result, parsing time could grow with the size of crafted data placed before the first boundary or after the closing boundary.\n\n### Impact\n\nAn attacker can send oversized malformed multipart bodies that consume excessive CPU time during request parsing, reducing request-handling capacity and delaying legitimate requests. This issue degrades availability but does not typically result in a complete denial of service for the entire application.\n\n### Mitigation\n\nUpgrade to version `0.0.26` or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.",
  "id": "GHSA-mj87-hwqh-73pj",
  "modified": "2026-04-24T20:51:11Z",
  "published": "2026-04-15T19:45:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-mj87-hwqh-73pj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40347"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Kludex/python-multipart"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Kludex/python-multipart/releases/tag/0.0.26"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "python-multipart affected by Denial of Service via large multipart preamble or epilogue data"
}

GHSA-MJ97-4C6J-MRCP

Vulnerability from github – Published: 2022-05-17 02:28 – Updated: 2022-05-17 02:28
VLAI
Details

kittoframework kitto version 0.5.1 is vulnerable to memory exhaustion in the router resulting in DoS

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2017-1000064"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-07-17T13:18:00Z",
    "severity": "HIGH"
  },
  "details": "kittoframework kitto version 0.5.1 is vulnerable to memory exhaustion in the router resulting in DoS",
  "id": "GHSA-mj97-4c6j-mrcp",
  "modified": "2022-05-17T02:28:10Z",
  "published": "2022-05-17T02:28:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-1000064"
    },
    {
      "type": "WEB",
      "url": "https://elixirforum.com/t/kitto-a-framework-for-interactive-dashboards/2089/13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MJ9H-GC79-CHG3

Vulnerability from github – Published: 2022-04-01 00:00 – Updated: 2022-04-06 00:01
VLAI
Details

totolink EX300_v2, ver V4.0.3c.140_B20210429 and A720R ,ver V4.1.5cu.470_B20200911 have an issue which causes uncontrolled resource consumption.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2021-43662"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-03-31T00:15:00Z",
    "severity": "MODERATE"
  },
  "details": "totolink EX300_v2, ver V4.0.3c.140_B20210429 and A720R ,ver V4.1.5cu.470_B20200911 have an issue which causes uncontrolled resource consumption.",
  "id": "GHSA-mj9h-gc79-chg3",
  "modified": "2022-04-06T00:01:41Z",
  "published": "2022-04-01T00:00:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-43662"
    },
    {
      "type": "WEB",
      "url": "https://github.com/chibataiki/iot-vuls/blob/main/totolink/dos.md"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MJGV-6QMW-8JWC

Vulnerability from github – Published: 2023-08-22 21:30 – Updated: 2024-04-04 07:05
VLAI
Details

An issue was discovered in function zzip_disk_entry_to_file_header in mmapped.c in zziplib 0.13.69, which will lead to a denial-of-service.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2020-18770"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-08-22T19:15:55Z",
    "severity": "MODERATE"
  },
  "details": "An issue was discovered in function zzip_disk_entry_to_file_header in mmapped.c in zziplib 0.13.69, which will lead to a denial-of-service.",
  "id": "GHSA-mjgv-6qmw-8jwc",
  "modified": "2024-04-04T07:05:32Z",
  "published": "2023-08-22T21:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-18770"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gdraheim/zziplib/issues/69"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MJGW-69FR-P4H2

Vulnerability from github – Published: 2022-05-24 17:43 – Updated: 2022-05-24 17:43
VLAI
Details

Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to a denial of service attack when too many connection attempts with an 'unknownProtocol' are established. This leads to a leak of file descriptors. If a file descriptor limit is configured on the system, then the server is unable to accept new connections and prevent the process also from opening, e.g. a file. If no file descriptor limit is configured, then this lead to an excessive memory usage and cause the system to run out of memory.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2021-22883"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-772"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-03-03T18:15:00Z",
    "severity": "HIGH"
  },
  "details": "Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to a denial of service attack when too many connection attempts with an \u0027unknownProtocol\u0027 are established. This leads to a leak of file descriptors. If a file descriptor limit is configured on the system, then the server is unable to accept new connections and prevent the process also from opening, e.g. a file. If no file descriptor limit is configured, then this lead to an excessive memory usage and cause the system to run out of memory.",
  "id": "GHSA-mjgw-69fr-p4h2",
  "modified": "2022-05-24T17:43:34Z",
  "published": "2022-05-24T17:43:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22883"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/1043360"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/E4FRS5ZVK4ZQ7XIJQNGIKUXG2DJFHLO7"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F45Y7TXSU33MTKB6AGL2Q5V5ZOCNPKOG"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HSYFUGKFUSZ27M5TEZ3FKILWTWFJTFAZ"
    },
    {
      "type": "WEB",
      "url": "https://nodejs.org/en/blog/vulnerability/february-2021-security-releases"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20210416-0001"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MJRJ-9494-78RR

Vulnerability from github – Published: 2022-05-24 17:17 – Updated: 2022-10-07 18:15
VLAI
Details

A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU version >= v5.0. Virtio-fs is meant to share a host file system directory with a guest via virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the host.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2020-10717"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-05-04T21:15:00Z",
    "severity": "LOW"
  },
  "details": "A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU version \u003e= v5.0. Virtio-fs is meant to share a host file system directory with a guest via virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the host.",
  "id": "GHSA-mjrj-9494-78rr",
  "modified": "2022-10-07T18:15:55Z",
  "published": "2022-05-24T17:17:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-10717"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10717"
    },
    {
      "type": "WEB",
      "url": "https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00141.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00143.html"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202011-09"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2020/05/04/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MJXW-242V-V9VM

Vulnerability from github – Published: 2026-03-18 18:31 – Updated: 2026-03-19 15:31
VLAI
Details

An issue in the VirtualHost configuration handling/parser component of aaPanel v7.57.0 allows attackers to cause a Regular Expression Denial of Service (ReDoS) via a crafted input.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-29856"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-18T18:16:27Z",
    "severity": "HIGH"
  },
  "details": "An issue in the VirtualHost configuration handling/parser component of aaPanel v7.57.0 allows attackers to cause a Regular Expression Denial of Service (ReDoS) via a crafted input.",
  "id": "GHSA-mjxw-242v-v9vm",
  "modified": "2026-03-19T15:31:19Z",
  "published": "2026-03-18T18:31:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29856"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aapanel/aapanel"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mbiesiad/vulnerability-research/tree/main/CVE-2026-29856"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MM3M-5497-XGGG

Vulnerability from github – Published: 2025-05-01 15:31 – Updated: 2025-10-02 21:32
VLAI
Summary
Elasticsearch Uncontrolled Resource Consumption Vulnerability
Details

Uncontrolled Resource Consumption in Elasticsearch while evaluating specifically crafted search templates with Mustache functions can lead to Denial of Service by causing the Elasticsearch node to crash.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.elasticsearch:elasticsearch"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.17.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.elasticsearch:elasticsearch"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0-alpha1"
            },
            {
              "fixed": "8.16.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-52979"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-02T21:32:25Z",
    "nvd_published_at": "2025-05-01T14:15:35Z",
    "severity": "MODERATE"
  },
  "details": "Uncontrolled Resource Consumption in Elasticsearch while evaluating specifically crafted search templates with Mustache functions can lead to Denial of Service by causing the Elasticsearch node to crash.",
  "id": "GHSA-mm3m-5497-xggg",
  "modified": "2025-10-02T21:32:25Z",
  "published": "2025-05-01T15:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-52979"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elastic/elasticsearch/pull/114002"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elastic/elasticsearch/commit/cbde7f456d7ccd98556302fccf3238bb4557fc91"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elastic/elasticsearch/commit/f9b6b57d1d0f76e2d14291c04fb50abeb642cfbf"
    },
    {
      "type": "WEB",
      "url": "https://discuss.elastic.co/t/elasticsearch-7-17-25-and-8-16-0-security-update-esa-2024-40/377709"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/elastic/elasticsearch"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Elasticsearch Uncontrolled Resource Consumption Vulnerability"
}

Mitigation
Architecture and Design

Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.

Mitigation
Architecture and Design
  • Mitigation of resource exhaustion attacks requires that the target system either:
  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
  • The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
  • recognizes the attack and denies that user further access for a given amount of time, or
  • uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Mitigation
Architecture and Design

Ensure that protocols have specific limits of scale placed on them.

Mitigation
Implementation

Ensure that all failures in resource allocation place the system into a safe posture.

CAPEC-147: XML Ping of the Death

An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.

CAPEC-227: Sustained Client Engagement

An adversary attempts to deny legitimate users access to a resource by continually engaging a specific resource in an attempt to keep the resource tied up as long as possible. The adversary's primary goal is not to crash or flood the target, which would alert defenders; rather it is to repeatedly perform actions or abuse algorithmic flaws such that a given resource is tied up and not available to a legitimate user. By carefully crafting a requests that keep the resource engaged through what is seemingly benign requests, legitimate users are limited or completely denied access to the resource.

CAPEC-492: Regular Expression Exponential Blowup

An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.