CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
5592 vulnerabilities reference this CWE, most recent first.
GHSA-3G45-CR6Q-GF5G
Vulnerability from github – Published: 2024-07-17 00:32 – Updated: 2025-11-04 18:31Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 8.0.37 and prior and 8.4.0 and prior. Easily exploitable vulnerability allows high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
{
"affected": [],
"aliases": [
"CVE-2024-21173"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-07-16T23:15:20Z",
"severity": "MODERATE"
},
"details": "Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 8.0.37 and prior and 8.4.0 and prior. Easily exploitable vulnerability allows high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).",
"id": "GHSA-3g45-cr6q-gf5g",
"modified": "2025-11-04T18:31:08Z",
"published": "2024-07-17T00:32:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-21173"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20240801-0001"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpujul2024.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-3G4P-M6J4-FXHJ
Vulnerability from github – Published: 2025-11-06 18:32 – Updated: 2025-11-10 18:30An issue in KiloView Dual Channel 4k HDMI & 3G-SDI HEVC Video Encoder Firmware v.1.20.0006 allows a remote attacker to cause a denial of service via the systemctrl API System/reFactory component.
{
"affected": [],
"aliases": [
"CVE-2025-63560"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-11-06T17:15:46Z",
"severity": "HIGH"
},
"details": "An issue in KiloView Dual Channel 4k HDMI \u0026 3G-SDI HEVC Video Encoder Firmware v.1.20.0006 allows a remote attacker to cause a denial of service via the systemctrl API System/reFactory component.",
"id": "GHSA-3g4p-m6j4-fxhj",
"modified": "2025-11-10T18:30:33Z",
"published": "2025-11-06T18:32:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-63560"
},
{
"type": "WEB",
"url": "https://darrinj99.github.io/writeups/kiloview_e3.html"
},
{
"type": "WEB",
"url": "https://github.com/Darrinj99/Vuln-Writeups-/blob/main/CVE-2025-63560/README.md"
},
{
"type": "WEB",
"url": "http://kiloview.com"
}
],
"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-3GF2-723M-W3FV
Vulnerability from github – Published: 2022-02-19 00:01 – Updated: 2025-05-30 21:30In Expat (aka libexpat) before 2.4.5, an attacker can trigger stack exhaustion in build_model via a large nesting depth in the DTD element.
{
"affected": [],
"aliases": [
"CVE-2022-25313"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-674"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-02-18T05:15:00Z",
"severity": "MODERATE"
},
"details": "In Expat (aka libexpat) before 2.4.5, an attacker can trigger stack exhaustion in build_model via a large nesting depth in the DTD element.",
"id": "GHSA-3gf2-723m-w3fv",
"modified": "2025-05-30T21:30:52Z",
"published": "2022-02-19T00:01:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-25313"
},
{
"type": "WEB",
"url": "https://github.com/libexpat/libexpat/pull/558"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202209-24"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20220303-0008"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2022/dsa-5085"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2022/02/19/1"
}
],
"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-3GFG-G579-3WMQ
Vulnerability from github – Published: 2026-04-21 21:31 – Updated: 2026-04-21 21:31Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45. Easily exploitable vulnerability allows high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
{
"affected": [],
"aliases": [
"CVE-2026-34267"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-21T21:16:30Z",
"severity": "MODERATE"
},
"details": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45. Easily exploitable vulnerability allows high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).",
"id": "GHSA-3gfg-g579-3wmq",
"modified": "2026-04-21T21:31:25Z",
"published": "2026-04-21T21:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34267"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuapr2026.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-3GP6-22QR-4J7F
Vulnerability from github – Published: 2022-05-13 01:44 – Updated: 2022-05-13 01:44A persistent denial of service vulnerability in Juniper Networks NorthStar Controller Application prior to version 2.1.0 Service Pack 1 may allow a malicious, network-based, authenticated attacker to consume enough system resources to cause a persistent denial of service by visiting certain specific URLs on the server.
{
"affected": [],
"aliases": [
"CVE-2017-2333"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-04-24T15:59:00Z",
"severity": "MODERATE"
},
"details": "A persistent denial of service vulnerability in Juniper Networks NorthStar Controller Application prior to version 2.1.0 Service Pack 1 may allow a malicious, network-based, authenticated attacker to consume enough system resources to cause a persistent denial of service by visiting certain specific URLs on the server.",
"id": "GHSA-3gp6-22qr-4j7f",
"modified": "2022-05-13T01:44:46Z",
"published": "2022-05-13T01:44:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-2333"
},
{
"type": "WEB",
"url": "https://kb.juniper.net/JSA10783"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/97608"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-3GVP-54V2-2JRP
Vulnerability from github – Published: 2023-04-04 15:30 – Updated: 2023-04-07 22:09An issue found in Directus API v.2.2.0 allows a remote attacker to cause a denial of service via a great amount of HTTP requests.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "directus"
},
"ranges": [
{
"events": [
{
"introduced": "2.2.0"
},
{
"fixed": "2.2.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.0"
]
}
],
"aliases": [
"CVE-2020-19850"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2023-04-07T22:09:07Z",
"nvd_published_at": "2023-04-04T15:15:00Z",
"severity": "MODERATE"
},
"details": "An issue found in Directus API v.2.2.0 allows a remote attacker to cause a denial of service via a great amount of HTTP requests.",
"id": "GHSA-3gvp-54v2-2jrp",
"modified": "2023-04-07T22:09:07Z",
"published": "2023-04-04T15:30:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-19850"
},
{
"type": "WEB",
"url": "https://github.com/directus/api/issues/982"
},
{
"type": "PACKAGE",
"url": "https://github.com/directus/v8-archive"
}
],
"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": "Directus API vulnerable to denial of service"
}
GHSA-3GW4-M5W7-V89C
Vulnerability from github – Published: 2020-06-11 00:04 – Updated: 2024-11-18 16:26Summary
Indy Node has a bug in TAA handling code. The current primary can be crashed with a malformed transaction from a client, which leads to a view change. Repeated rapid view changes have the potential of bringing down the network.
Discovery
On May 18, Evernym's monitoring of Sovrin StagingNet showed a report of StagingNet losing sufficient consensus to validate write transactions. The problem resolved itself within a few minutes. On May 20th we saw the alert multiple times, and we began analyzing the logs of our steward node. On May 21st we continued to see the alerts with increasing frequency.
It appears that someone is unknowingly sending a malformed transaction, and retrying when the transaction fails. The cause of the errors appear to be the TAA acceptance.
Proposed actions
- Reproduce problem in integration tests and create a fix
- Do a hotfix release branching from last stable (current master have some things merged that are too risky)
- Upgrade BuilderNet, StagingNet and MainNet as soon as possible
- Improve testing strategy on Indy Node to reduce probability of such bugs
Notes
- The journalctl logs also show an out-of-memory problem on the Australia node. We need to evaluate if this should be raised as a separate issue.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "indy-node"
},
"ranges": [
{
"events": [
{
"introduced": "1.12.2"
},
{
"fixed": "1.12.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.12.2"
]
}
],
"aliases": [
"CVE-2020-11090"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2020-06-11T00:02:06Z",
"nvd_published_at": null,
"severity": "CRITICAL"
},
"details": "# Summary\nIndy Node has a bug in TAA handling code. The current primary can be crashed with a malformed transaction from a client, which leads to a view change. Repeated rapid view changes have the potential of bringing down the network.\n\n# Discovery\nOn May 18, Evernym\u0027s monitoring of Sovrin StagingNet showed a report of StagingNet losing sufficient consensus to validate write transactions. The problem resolved itself within a few minutes. On May 20th we saw the alert multiple times, and we began analyzing the logs of our steward node. On May 21st we continued to see the alerts with increasing frequency.\n\nIt appears that someone is unknowingly sending a malformed transaction, and retrying when the transaction fails. The cause of the errors appear to be the TAA acceptance.\n\n# Proposed actions\n* Reproduce problem in integration tests and create a fix\n* Do a hotfix release branching from last stable (current master have some things merged that are too risky)\n* Upgrade BuilderNet, StagingNet and MainNet as soon as possible\n* Improve testing strategy on Indy Node to reduce probability of such bugs\n\n# Notes\n* The journalctl logs also show an out-of-memory problem on the Australia node. We need to evaluate if this should be raised as a separate issue.",
"id": "GHSA-3gw4-m5w7-v89c",
"modified": "2024-11-18T16:26:06Z",
"published": "2020-06-11T00:04:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/hyperledger/indy-node/security/advisories/GHSA-3gw4-m5w7-v89c"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11090"
},
{
"type": "PACKAGE",
"url": "https://github.com/hyperledger/indy-node"
},
{
"type": "WEB",
"url": "https://github.com/hyperledger/indy-node/blob/master/CHANGELOG.md#1123"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/indy-node/PYSEC-2020-47.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/indy-node/1.12.3"
}
],
"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"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in Indy Node"
}
GHSA-3GXG-HFHR-6G9X
Vulnerability from github – Published: 2023-02-21 18:30 – Updated: 2025-03-17 18:31Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length.
{
"affected": [],
"aliases": [
"CVE-2023-23009"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-02-21T16:15:00Z",
"severity": "HIGH"
},
"details": "Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length.",
"id": "GHSA-3gxg-hfhr-6g9x",
"modified": "2025-03-17T18:31:33Z",
"published": "2023-02-21T18:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23009"
},
{
"type": "WEB",
"url": "https://github.com/libreswan/libreswan/issues/954"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MFOIQX2LRL43P3GJT33DE7G7COHNXDN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CSMYJH7MC2FZGCY5NH5AXULO3ISXIHOF"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2MFOIQX2LRL43P3GJT33DE7G7COHNXDN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CSMYJH7MC2FZGCY5NH5AXULO3ISXIHOF"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2023/dsa-5368"
}
],
"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-3H26-8WFG-F6VH
Vulnerability from github – Published: 2022-05-24 17:36 – Updated: 2022-05-24 17:36In read_metadata_vorbiscomment_ of stream_decoder.c, there is possible memory exhaustion due to a memory leak. This could lead to remote denial of service with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-124775381
{
"affected": [],
"aliases": [
"CVE-2020-0487"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-12-15T16:15:00Z",
"severity": "MODERATE"
},
"details": "In read_metadata_vorbiscomment_ of stream_decoder.c, there is possible memory exhaustion due to a memory leak. This could lead to remote denial of service with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-124775381",
"id": "GHSA-3h26-8wfg-f6vh",
"modified": "2022-05-24T17:36:26Z",
"published": "2022-05-24T17:36:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-0487"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/pixel/2020-12-01"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-3H29-52VH-PQGR
Vulnerability from github – Published: 2021-05-07 15:53 – Updated: 2022-10-07 20:39A carefully crafted or corrupt PSD file can cause excessive memory usage in Apache Tika's PSDParser in versions 1.0-1.23.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.23"
},
"package": {
"ecosystem": "Maven",
"name": "org.apache.tika:tika"
},
"ranges": [
{
"events": [
{
"introduced": "1.0"
},
{
"fixed": "1.24"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-1950"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-05T22:51:14Z",
"nvd_published_at": "2020-03-23T14:15:00Z",
"severity": "MODERATE"
},
"details": "A carefully crafted or corrupt PSD file can cause excessive memory usage in Apache Tika\u0027s PSDParser in versions 1.0-1.23.",
"id": "GHSA-3h29-52vh-pqgr",
"modified": "2022-10-07T20:39:59Z",
"published": "2021-05-07T15:53:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-1950"
},
{
"type": "PACKAGE",
"url": "https://github.com/apache/tika"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r463b1a67817ae55fe022536edd6db34e8f9636971188430cbcf8a8dd%40%3Cdev.tika.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2020/03/msg00035.html"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/4564-1"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpujul2020.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
}
],
"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"
}
],
"summary": "Uncontrolled Resource Consumption in Apache Tika"
}
Mitigation
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
- 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
Ensure that protocols have specific limits of scale placed on them.
Mitigation
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.