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.

5412 vulnerabilities reference this CWE, most recent first.

GHSA-VPR3-HPF9-H2R8

Vulnerability from github – Published: 2023-12-12 12:30 – Updated: 2023-12-15 15:30
VLAI
Details

Denial-of-service (DoS) vulnerability exists in rfe service of HMI GC-A2 series. If a remote unauthenticated attacker sends a specially crafted packets to specific ports, a denial-of-service (DoS) condition may occur.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-49143"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-12-12T10:15:10Z",
    "severity": "HIGH"
  },
  "details": "Denial-of-service (DoS) vulnerability exists in rfe service of HMI GC-A2 series. If a remote unauthenticated attacker sends a specially crafted packets to specific ports, a denial-of-service (DoS) condition may occur.",
  "id": "GHSA-vpr3-hpf9-h2r8",
  "modified": "2023-12-15T15:30:21Z",
  "published": "2023-12-12T12:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-49143"
    },
    {
      "type": "WEB",
      "url": "https://jvn.jp/en/jp/JVN34145838"
    },
    {
      "type": "WEB",
      "url": "https://www.electronics.jtekt.co.jp/en/topics/202312116562"
    }
  ],
  "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-VPXM-346X-6362

Vulnerability from github – Published: 2022-12-12 15:30 – Updated: 2022-12-14 15:30
VLAI
Details

A vulnerability exists in the ArubaOS bootloader on 7xxx series controllers which can result in a denial of service (DoS) condition on an impacted system. A successful attacker can cause a system hang which can only be resolved via a power cycle of the impacted controller.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-37907"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-12-12T13:15:00Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability exists in the ArubaOS bootloader on 7xxx series controllers which can result in a denial of service (DoS) condition on an impacted system. A successful attacker can cause a system hang which can only be resolved via a power cycle of the impacted controller.",
  "id": "GHSA-vpxm-346x-6362",
  "modified": "2022-12-14T15:30:17Z",
  "published": "2022-12-12T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-37907"
    },
    {
      "type": "WEB",
      "url": "https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-016.txt"
    }
  ],
  "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-VPXX-H23G-GXH2

Vulnerability from github – Published: 2026-05-07 18:30 – Updated: 2026-05-12 16:20
VLAI
Summary
youtube-regex vulnerable to Regex Denial of Service
Details

Regex Denial of Service in youtube-regex npm package through version 1.0.5.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "youtube-regex"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.0.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-65122"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-12T16:20:14Z",
    "nvd_published_at": "2026-05-07T16:16:17Z",
    "severity": "HIGH"
  },
  "details": "Regex Denial of Service in youtube-regex npm package through version 1.0.5.",
  "id": "GHSA-vpxx-h23g-gxh2",
  "modified": "2026-05-12T16:20:14Z",
  "published": "2026-05-07T18:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-65122"
    },
    {
      "type": "WEB",
      "url": "https://github.com/regexhq/youtube-regex/issues/14"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/6en6ar/66ef99397068c0a5e0d963bc47d7172c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/regexhq/youtube-regex"
    }
  ],
  "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"
    }
  ],
  "summary": "youtube-regex vulnerable to Regex Denial of Service"
}

GHSA-VQ23-HWG7-HXRH

Vulnerability from github – Published: 2022-12-21 21:30 – Updated: 2022-12-29 01:06
VLAI
Summary
EnumStringValues vulnerable to Uncontrolled Resource Consumption
Details

A vulnerability was found in Brondahl EnumStringValues 4.0.1. It has been declared as problematic. This vulnerability affects the function GetStringValuesWithPreferences_Uncache of the file EnumStringValues/EnumExtensions.cs. The manipulation leads to resource consumption. Upgrading to version 4.0.2 to address this issue. The name of the patch is c0fc7806beb24883cc2f9543ebc50c0820297307. It is recommended to upgrade the affected component. VDB-216466 is the identifier assigned to this vulnerability.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "EnumStringValues"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-36620"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-404"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-12-22T03:35:03Z",
    "nvd_published_at": "2022-12-21T19:15:00Z",
    "severity": "LOW"
  },
  "details": "A vulnerability was found in Brondahl EnumStringValues 4.0.1. It has been declared as problematic. This vulnerability affects the function GetStringValuesWithPreferences_Uncache of the file EnumStringValues/EnumExtensions.cs. The manipulation leads to resource consumption. Upgrading to version 4.0.2 to address this issue. The name of the patch is c0fc7806beb24883cc2f9543ebc50c0820297307. It is recommended to upgrade the affected component. VDB-216466 is the identifier assigned to this vulnerability.",
  "id": "GHSA-vq23-hwg7-hxrh",
  "modified": "2022-12-29T01:06:02Z",
  "published": "2022-12-21T21:30:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-36620"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Brondahl/EnumStringValues/commit/c0fc7806beb24883cc2f9543ebc50c0820297307"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Brondahl/EnumStringValues"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Brondahl/EnumStringValues/releases/tag/4.0.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Brondahl/EnumStringValues/releases/tag/4.0.2"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.216466"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "EnumStringValues vulnerable to Uncontrolled Resource Consumption"
}

GHSA-VQ4H-GF44-5HCQ

Vulnerability from github – Published: 2022-05-24 22:28 – Updated: 2022-05-24 22:28
VLAI
Details

SITEL CAP/PRX firmware version 5.2.01, allows an attacker with access to the device´s network to cause a denial of service condition on the device. An attacker could exploit this vulnerability by sending HTTP requests massively.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2021-32455"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-05-17T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "SITEL CAP/PRX firmware version 5.2.01, allows an attacker with access to the device\u00b4s network to cause a denial of service condition on the device. An attacker could exploit this vulnerability by sending HTTP requests massively.",
  "id": "GHSA-vq4h-gf44-5hcq",
  "modified": "2022-05-24T22:28:59Z",
  "published": "2022-05-24T22:28:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32455"
    },
    {
      "type": "WEB",
      "url": "https://www.incibe-cert.es/en/early-warning/ics-advisories/sitel-capprx-vulnerable-denial-service-attack"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-VQ5F-VPGW-9VCP

Vulnerability from github – Published: 2022-05-13 01:03 – Updated: 2022-05-13 01:03
VLAI
Details

nginx before versions 1.15.6, 1.14.1 has a vulnerability in the ngx_http_mp4_module, which might allow an attacker to cause infinite loop in a worker process, cause a worker process crash, or might result in worker process memory disclosure by using a specially crafted mp4 file. The issue only affects nginx if it is built with the ngx_http_mp4_module (the module is not built by default) and the .mp4. directive is used in the configuration file. Further, the attack is only possible if an attacker is able to trigger processing of a specially crafted mp4 file with the ngx_http_mp4_module.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2018-16845"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-11-07T14:29:00Z",
    "severity": "MODERATE"
  },
  "details": "nginx before versions 1.15.6, 1.14.1 has a vulnerability in the ngx_http_mp4_module, which might allow an attacker to cause infinite loop in a worker process, cause a worker process crash, or might result in worker process memory disclosure by using a specially crafted mp4 file. The issue only affects nginx if it is built with the ngx_http_mp4_module (the module is not built by default) and the .mp4. directive is used in the configuration file. Further, the attack is only possible if an attacker is able to trigger processing of a specially crafted mp4 file with the ngx_http_mp4_module.",
  "id": "GHSA-vq5f-vpgw-9vcp",
  "modified": "2022-05-13T01:03:32Z",
  "published": "2022-05-13T01:03:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-16845"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2018:3652"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2018:3653"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2018:3680"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2018:3681"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16845"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2018/11/msg00010.html"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/kb/HT212818"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3812-1"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2018/dsa-4335"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html"
    },
    {
      "type": "WEB",
      "url": "http://mailman.nginx.org/pipermail/nginx-announce/2018/000221.html"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2021/Sep/36"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/105868"
    },
    {
      "type": "WEB",
      "url": "http://www.securitytracker.com/id/1042039"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-VQ69-6GCM-2FF7

Vulnerability from github – Published: 2024-05-07 21:31 – Updated: 2024-07-03 18:39
VLAI
Details

In multiple functions of AppOpsService.java, there is a possible way to saturate the content of /data/system/appops_accesses.xml due to resource exhaustion. This could lead to local denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-23712"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-07T21:15:08Z",
    "severity": "MODERATE"
  },
  "details": "In multiple functions of AppOpsService.java, there is a possible way to saturate the content of /data/system/appops_accesses.xml due to resource exhaustion. This could lead to local denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.",
  "id": "GHSA-vq69-6gcm-2ff7",
  "modified": "2024-07-03T18:39:50Z",
  "published": "2024-05-07T21:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-23712"
    },
    {
      "type": "WEB",
      "url": "https://android.googlesource.com/platform/frameworks/base/+/6beb68ca17d1220f3f09a53cf0a0c541db4ead62"
    },
    {
      "type": "WEB",
      "url": "https://source.android.com/security/bulletin/2024-04-01"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-VQ74-9583-HRM4

Vulnerability from github – Published: 2022-05-17 19:57 – Updated: 2023-08-07 20:36
VLAI
Summary
Publify vulnerable to DoS attack
Details

Publify before 8.0.1 is vulnerable to a Denial of Service attack

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "publify_core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2014-3211"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-08-07T20:36:01Z",
    "nvd_published_at": "2020-01-09T14:15:00Z",
    "severity": "HIGH"
  },
  "details": "Publify before 8.0.1 is vulnerable to a Denial of Service attack",
  "id": "GHSA-vq74-9583-hrm4",
  "modified": "2023-08-07T20:36:01Z",
  "published": "2022-05-17T19:57:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2014-3211"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/publify/publify"
    },
    {
      "type": "WEB",
      "url": "https://hackmysystems.tumblr.com/post/85475092711/denial-of-service-in-publify-cve-2014-3211"
    }
  ],
  "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"
    }
  ],
  "summary": "Publify vulnerable to DoS attack"
}

GHSA-VQ76-RXX3-4R4R

Vulnerability from github – Published: 2022-05-13 01:44 – Updated: 2024-05-14 20:53
VLAI
Summary
OpenStack Nova DoS by rebuilding the same instance with a new image multiple times
Details

An issue was discovered in the default FilterScheduler in OpenStack Nova 16.0.3. By repeatedly rebuilding an instance with new images, an authenticated user may consume untracked resources on a hypervisor host leading to a denial of service, aka doubled resource allocations. This regression was introduced with the fix for OSSA-2017-005 (CVE-2017-16239); however, only Nova stable/pike or later deployments with that fix applied and relying on the default FilterScheduler are affected.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "nova"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "16.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2017-17051"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-05-14T20:53:42Z",
    "nvd_published_at": "2017-12-05T18:29:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in the default FilterScheduler in OpenStack Nova 16.0.3. By repeatedly rebuilding an instance with new images, an authenticated user may consume untracked resources on a hypervisor host leading to a denial of service, aka doubled resource allocations. This regression was introduced with the fix for OSSA-2017-005 (CVE-2017-16239); however, only Nova stable/pike or later deployments with that fix applied and relying on the default FilterScheduler are affected.",
  "id": "GHSA-vq76-rxx3-4r4r",
  "modified": "2024-05-14T20:53:42Z",
  "published": "2022-05-13T01:44:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-17051"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openstack/nova/commit/25a1d78e83065c5bea5d8e0a017fd9d0914d41d9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openstack/nova/commit/fed660c1189fdf4159d97badfdc8c5b35ad14f23"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openstack/nova"
    },
    {
      "type": "WEB",
      "url": "https://launchpad.net/bugs/1732976"
    },
    {
      "type": "WEB",
      "url": "https://review.openstack.org/521662"
    },
    {
      "type": "WEB",
      "url": "https://review.openstack.org/523214"
    },
    {
      "type": "WEB",
      "url": "https://security.openstack.org/ossa/OSSA-2017-006.html"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/102102"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenStack Nova DoS by rebuilding the same instance with a new image multiple times"
}

GHSA-VQ7V-82FM-4659

Vulnerability from github – Published: 2022-05-24 17:36 – Updated: 2022-08-07 00:00
VLAI
Details

Philips Hue is vulnerable to a Denial of Service attack. Sending a SYN flood on port tcp/80 will freeze Philips Hue's hub and it will stop responding. The "hub" will stop operating and be frozen until the flood stops. During the flood, the user won't be able to turn on/off the lights, and all of the hub's functionality will be unresponsive. The cloud service also won't work with the hub.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2018-7580"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-12-21T21:15:00Z",
    "severity": "HIGH"
  },
  "details": "Philips Hue is vulnerable to a Denial of Service attack. Sending a SYN flood on port tcp/80 will freeze Philips Hue\u0027s hub and it will stop responding. The \"hub\" will stop operating and be frozen until the flood stops. During the flood, the user won\u0027t be able to turn on/off the lights, and all of the hub\u0027s functionality will be unresponsive. The cloud service also won\u0027t work with the hub.",
  "id": "GHSA-vq7v-82fm-4659",
  "modified": "2022-08-07T00:00:30Z",
  "published": "2022-05-24T17:36:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-7580"
    },
    {
      "type": "WEB",
      "url": "https://www.iliashn.com/CVE-2018-7580"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/160724/Philips-Hue-Denial-Of-Service.html"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2020/Dec/51"
    }
  ],
  "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"
    }
  ]
}

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.