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.

5423 vulnerabilities reference this CWE, most recent first.

GHSA-GMQQ-HRF4-4GVF

Vulnerability from github – Published: 2022-05-24 17:37 – Updated: 2022-05-24 17:37
VLAI
Details

When a BIG-IP ASM or Advanced WAF system running version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, or 11.6.1-11.6.5.2 processes requests with JSON payload, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2020-27718"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-12-24T15:15:00Z",
    "severity": "HIGH"
  },
  "details": "When a BIG-IP ASM or Advanced WAF system running version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, or 11.6.1-11.6.5.2 processes requests with JSON payload, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process.",
  "id": "GHSA-gmqq-hrf4-4gvf",
  "modified": "2022-05-24T17:37:13Z",
  "published": "2022-05-24T17:37:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27718"
    },
    {
      "type": "WEB",
      "url": "https://support.f5.com/csp/article/K58102101"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-GP4V-QVH9-46X6

Vulnerability from github – Published: 2022-05-24 17:00 – Updated: 2024-04-04 02:35
VLAI
Details

qtum through 0.16 (a chain-based proof-of-stake cryptocurrency) allows a remote denial of service. The attacker sends invalid headers/blocks. The attack requires no stake and can fill the victim's disk and RAM.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2018-19151"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-10-29T20:15:00Z",
    "severity": "HIGH"
  },
  "details": "qtum through 0.16 (a chain-based proof-of-stake cryptocurrency) allows a remote denial of service. The attacker sends invalid headers/blocks. The attack requires no stake and can fill the victim\u0027s disk and RAM.",
  "id": "GHSA-gp4v-qvh9-46x6",
  "modified": "2024-04-04T02:35:48Z",
  "published": "2022-05-24T17:00:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-19151"
    },
    {
      "type": "WEB",
      "url": "https://medium.com/%40dsl_uiuc/fake-stake-attacks-on-chain-based-proof-of-stake-cryptocurrencies-b8b05723f806"
    },
    {
      "type": "WEB",
      "url": "https://medium.com/@dsl_uiuc/fake-stake-attacks-on-chain-based-proof-of-stake-cryptocurrencies-b8b05723f806"
    },
    {
      "type": "WEB",
      "url": "http://fc19.ifca.ai/preproceedings/180-preproceedings.pdf"
    }
  ],
  "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-GP6V-Q35C-7FH4

Vulnerability from github – Published: 2023-03-14 18:30 – Updated: 2023-03-14 18:30
VLAI
Details

Microsoft Excel Denial of Service Vulnerability

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-23396"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-03-14T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Microsoft Excel Denial of Service Vulnerability",
  "id": "GHSA-gp6v-q35c-7fh4",
  "modified": "2023-03-14T18:30:18Z",
  "published": "2023-03-14T18:30:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23396"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23396"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GP9C-PM5M-5CXR

Vulnerability from github – Published: 2026-06-26 21:53 – Updated: 2026-06-26 21:53
VLAI
Summary
Hackney: `ssl:connect/2` post-handshake upgrade has no timeout
Details

Summary

The SOCKS5 transport in src/hackney_socks5.erl correctly applies the caller-supplied timeout to the SOCKS5 negotiation phase, but then upgrades the tunnel to TLS using ssl:connect/2 (the two-argument form), which defaults to infinity. The Timeout value is in scope at that call site but is never forwarded. A hostile or man-in-the-middled SOCKS5 proxy that completes the SOCKS5 handshake normally and then stalls the TLS exchange will pin the connecting Erlang process and socket indefinitely, regardless of any connect_timeout or recv_timeout options the caller set.

Details

In src/hackney_socks5.erl, line 65, after the SOCKS5 negotiation succeeds, the code calls:

ssl:connect(Socket, SSLOpts)

The three-argument form ssl:connect/3 takes a timeout; the two-argument form used here defaults to infinity. The variable Timeout (already used for SOCKS5 recv calls earlier in the same function) is simply not passed. The bytes that drive the TLS handshake on the upstream side of the tunnel come from whatever endpoint the proxy connects to. A hostile proxy can complete SOCKS5 normally, then either stay silent or send a partial ServerHello and stop, keeping ssl:connect/2 blocked forever. No certificate forgery is needed.

PoC

  1. Stand up a SOCKS5 proxy that completes the SOCKS5 greeting and CONNECT reply normally, then goes silent (never sends a TLS ServerHello).
  2. Issue an HTTPS request through it via hackney with connect_timeout and recv_timeout set to a short value (e.g. 2000 ms).
  3. Observe the calling process remains blocked well past the configured timeout, consuming a process and socket until killed externally.

Impact

Denial of service via unbounded process and socket consumption. Affects hackney 0.10.0 through 4.0.0 for any HTTPS request routed through a SOCKS5 proxy. The connect_timeout and recv_timeout options give a false sense of safety since they are not honored during the TLS upgrade. CVSS v4.0: 8.2 (HIGH).

Resources

  • Introduction commit: https://github.com/benoitc/hackney/commit/34cdbd1d20a282aacc286a89327465a3925b4c5d
  • Patch commit: https://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236dae
Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "Hex",
        "name": "hackney"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.10.0"
            },
            {
              "fixed": "4.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47071"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-26T21:53:50Z",
    "nvd_published_at": "2026-05-25T15:16:22Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe SOCKS5 transport in `src/hackney_socks5.erl` correctly applies the caller-supplied timeout to the SOCKS5 negotiation phase, but then upgrades the tunnel to TLS using `ssl:connect/2` (the two-argument form), which defaults to `infinity`. The `Timeout` value is in scope at that call site but is never forwarded. A hostile or man-in-the-middled SOCKS5 proxy that completes the SOCKS5 handshake normally and then stalls the TLS exchange will pin the connecting Erlang process and socket indefinitely, regardless of any `connect_timeout` or `recv_timeout` options the caller set.\n\n### Details\n\nIn `src/hackney_socks5.erl`, line 65, after the SOCKS5 negotiation succeeds, the code calls:\n\n```erlang\nssl:connect(Socket, SSLOpts)\n```\n\nThe three-argument form `ssl:connect/3` takes a timeout; the two-argument form used here defaults to `infinity`. The variable `Timeout` (already used for SOCKS5 recv calls earlier in the same function) is simply not passed. The bytes that drive the TLS handshake on the upstream side of the tunnel come from whatever endpoint the proxy connects to. A hostile proxy can complete SOCKS5 normally, then either stay silent or send a partial `ServerHello` and stop, keeping `ssl:connect/2` blocked forever. No certificate forgery is needed.\n\n### PoC\n\n1. Stand up a SOCKS5 proxy that completes the SOCKS5 greeting and CONNECT reply normally, then goes silent (never sends a TLS ServerHello).\n2. Issue an HTTPS request through it via hackney with `connect_timeout` and `recv_timeout` set to a short value (e.g. 2000 ms).\n3. Observe the calling process remains blocked well past the configured timeout, consuming a process and socket until killed externally.\n\n### Impact\n\nDenial of service via unbounded process and socket consumption. Affects hackney 0.10.0 through 4.0.0 for any HTTPS request routed through a SOCKS5 proxy. The `connect_timeout` and `recv_timeout` options give a false sense of safety since they are not honored during the TLS upgrade. CVSS v4.0: **8.2 (HIGH)**.\n\n## Resources\n\n* Introduction commit: https://github.com/benoitc/hackney/commit/34cdbd1d20a282aacc286a89327465a3925b4c5d\n* Patch commit: https://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236dae",
  "id": "GHSA-gp9c-pm5m-5cxr",
  "modified": "2026-06-26T21:53:50Z",
  "published": "2026-06-26T21:53:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47071"
    },
    {
      "type": "WEB",
      "url": "https://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236dae"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-47071.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/benoitc/hackney"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47071"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Hackney: `ssl:connect/2` post-handshake upgrade has no timeout"
}

GHSA-GPGJ-87V4-MJ9R

Vulnerability from github – Published: 2024-05-17 15:31 – Updated: 2024-07-03 18:42
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Prevent crash when disable stream

[Why] Disabling stream encoder invokes a function that no longer exists.

[How] Check if the function declaration is NULL in disable stream encoder.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-35799"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-17T14:15:12Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Prevent crash when disable stream\n\n[Why]\nDisabling stream encoder invokes a function that no longer exists.\n\n[How]\nCheck if the function declaration is NULL in disable stream encoder.",
  "id": "GHSA-gpgj-87v4-mj9r",
  "modified": "2024-07-03T18:42:25Z",
  "published": "2024-05-17T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35799"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b17133a0a2e0e111803124dad09e803718d4a48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4356a2c3f296503c8b420ae8adece053960a9f06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59772327d439874095516673b4b30c48bd83ca38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72d72e8fddbcd6c98e1b02d32cf6f2b04e10bd1c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GPJV-6R8H-VP58

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33
VLAI
Details

IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 is vulnerable to running out of memory when executing certain queries with MDC tables.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-6052"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:34Z",
    "severity": "MODERATE"
  },
  "details": "IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 is vulnerable to running out of memory when executing certain queries with MDC tables.",
  "id": "GHSA-gpjv-6r8h-vp58",
  "modified": "2026-05-27T15:33:24Z",
  "published": "2026-05-27T15:33:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6052"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7273557"
    }
  ],
  "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-GQ56-J6HH-XR2P

Vulnerability from github – Published: 2022-05-06 00:00 – Updated: 2022-05-13 00:00
VLAI
Details

On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5, 14.1.x versions prior to 14.1.4.6, and 13.1.x versions prior to 13.1.5, when a Real Time Streaming Protocol (RTSP) profile is configured on a virtual server, undisclosed traffic can cause an increase in Traffic Management Microkernel (TMM) resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-28691"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-05-05T17:15:00Z",
    "severity": "HIGH"
  },
  "details": "On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5, 14.1.x versions prior to 14.1.4.6, and 13.1.x versions prior to 13.1.5, when a Real Time Streaming Protocol (RTSP) profile is configured on a virtual server, undisclosed traffic can cause an increase in Traffic Management Microkernel (TMM) resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated",
  "id": "GHSA-gq56-j6hh-xr2p",
  "modified": "2022-05-13T00:00:55Z",
  "published": "2022-05-06T00:00:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28691"
    },
    {
      "type": "WEB",
      "url": "https://support.f5.com/csp/article/K37155600"
    }
  ],
  "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-GQ97-QJ3M-VHJH

Vulnerability from github – Published: 2024-03-22 21:30 – Updated: 2024-03-22 21:30
VLAI
Details

Uncontrolled resource consumption for some Intel(R) SPS firmware before version SPS_E5_06.01.04.002.0 may allow a privileged user to potentially enable denial of service via network access.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-29153"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-14T14:15:49Z",
    "severity": "MODERATE"
  },
  "details": "Uncontrolled resource consumption for some Intel(R) SPS firmware before version SPS_E5_06.01.04.002.0 may allow a privileged user to potentially enable denial of service via network access.",
  "id": "GHSA-gq97-qj3m-vhjh",
  "modified": "2024-03-22T21:30:56Z",
  "published": "2024-03-22T21:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-29153"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240322-0005"
    },
    {
      "type": "WEB",
      "url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01003.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GQC7-GJGF-XVMG

Vulnerability from github – Published: 2025-01-14 18:32 – Updated: 2025-01-14 18:32
VLAI
Details

Microsoft Message Queuing (MSMQ) Denial of Service Vulnerability

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-21251"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-14T18:15:42Z",
    "severity": "HIGH"
  },
  "details": "Microsoft Message Queuing (MSMQ) Denial of Service Vulnerability",
  "id": "GHSA-gqc7-gjgf-xvmg",
  "modified": "2025-01-14T18:32:03Z",
  "published": "2025-01-14T18:32:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21251"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21251"
    }
  ],
  "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-GQC9-9F54-XC45

Vulnerability from github – Published: 2022-06-07 00:00 – Updated: 2022-06-14 00:00
VLAI
Details

An issue has been discovered in GitLab CE/EE affecting all versions starting from 14.3 before 14.9.5, all versions starting from 14.10 before 14.10.4, all versions starting from 15.0 before 15.0.1. It may be possible for malicious group maintainers to add new members to a project within their group, through the REST API, even after their group owner enabled a setting to prevent members from being added to projects within that group.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-1783"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-06-06T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "An issue has been discovered in GitLab CE/EE affecting all versions starting from 14.3 before 14.9.5, all versions starting from 14.10 before 14.10.4, all versions starting from 15.0 before 15.0.1. It may be possible for malicious group maintainers to add new members to a project within their group, through the REST API, even after their group owner enabled a setting to prevent members from being added to projects within that group.",
  "id": "GHSA-gqc9-9f54-xc45",
  "modified": "2022-06-14T00:00:28Z",
  "published": "2022-06-07T00:00:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-1783"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/1472109"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2022/CVE-2022-1783.json"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/353121"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N",
      "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.