CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
6267 vulnerabilities reference this CWE, most recent first.
GHSA-8225-6CVR-8PQP
Vulnerability from github – Published: 2018-08-09 20:13 – Updated: 2023-09-08 23:55Affected versions of superagent do not check the post-decompression size of ZIP compressed HTTP responses prior to decompressing. This results in the package being vulnerable to a ZIP bomb attack, where an extremely small ZIP file becomes many orders of magnitude larger when decompressed.
This may result in unrestrained CPU/Memory/Disk consumption, causing a denial of service condition.
Recommendation
Update to version 3.7.0 or later.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "superagent"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.7.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2017-16129"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-409"
],
"github_reviewed": true,
"github_reviewed_at": "2020-06-16T21:23:56Z",
"nvd_published_at": null,
"severity": "MODERATE"
},
"details": "Affected versions of `superagent` do not check the post-decompression size of ZIP compressed HTTP responses prior to decompressing. This results in the package being vulnerable to a [ZIP bomb](https://en.wikipedia.org/wiki/Zip_bomb) attack, where an extremely small ZIP file becomes many orders of magnitude larger when decompressed. \n\nThis may result in unrestrained CPU/Memory/Disk consumption, causing a denial of service condition.\n\n\n## Recommendation\n\nUpdate to version 3.7.0 or later.",
"id": "GHSA-8225-6cvr-8pqp",
"modified": "2023-09-08T23:55:11Z",
"published": "2018-08-09T20:13:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-16129"
},
{
"type": "WEB",
"url": "https://github.com/visionmedia/superagent/issues/1259"
},
{
"type": "WEB",
"url": "https://en.wikipedia.org/wiki/Zip_bomb"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-8225-6cvr-8pqp"
},
{
"type": "WEB",
"url": "https://www.npmjs.com/advisories/479"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "superagent vulnerable to zip bomb attacks"
}
GHSA-8237-3Q5G-99FV
Vulnerability from github – Published: 2023-02-25 06:30 – Updated: 2023-02-27 14:56All versions of the package lite-web-server are vulnerable to Denial of Service (DoS) when an attacker sends an HTTP request and includes control characters that the decodeURI() function is unable to parse.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "lite-web-server"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.2.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-26104"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2023-02-27T14:56:32Z",
"nvd_published_at": "2023-02-25T05:15:00Z",
"severity": "HIGH"
},
"details": "All versions of the package lite-web-server are vulnerable to Denial of Service (DoS) when an attacker sends an HTTP request and includes control characters that the decodeURI() function is unable to parse.",
"id": "GHSA-8237-3q5g-99fv",
"modified": "2023-02-27T14:56:32Z",
"published": "2023-02-25T06:30:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-26104"
},
{
"type": "WEB",
"url": "https://gist.github.com/lirantal/637520812da06fffb91dd86d02ff6bde"
},
{
"type": "PACKAGE",
"url": "https://github.com/chasyumen/lite-web-server"
},
{
"type": "WEB",
"url": "https://github.com/chasyumen/lite-web-server/blob/main/src/WebServer.js#23L274"
},
{
"type": "WEB",
"url": "https://security.snyk.io/vuln/SNYK-JS-LITEWEBSERVER-3153703"
}
],
"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": "Denial of Service vulnerability in lite-web-server"
}
GHSA-823G-P8G4-Q559
Vulnerability from github – Published: 2022-05-24 19:02 – Updated: 2022-05-24 19:02Kibana versions before 7.12.1 contain a denial of service vulnerability was found in the webhook actions due to a lack of timeout or a limit on the request size. An attacker with permissions to create webhook actions could drain the Kibana host connection pool, making Kibana unavailable for all other users.
{
"affected": [],
"aliases": [
"CVE-2021-22139"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-05-13T18:15:00Z",
"severity": "MODERATE"
},
"details": "Kibana versions before 7.12.1 contain a denial of service vulnerability was found in the webhook actions due to a lack of timeout or a limit on the request size. An attacker with permissions to create webhook actions could drain the Kibana host connection pool, making Kibana unavailable for all other users.",
"id": "GHSA-823g-p8g4-q559",
"modified": "2022-05-24T19:02:19Z",
"published": "2022-05-24T19:02:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22139"
},
{
"type": "WEB",
"url": "https://discuss.elastic.co/t/7-12-1-security-update/271433"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-826G-P4H4-G7X3
Vulnerability from github – Published: 2025-01-28 00:32 – Updated: 2025-11-03 21:32The issue was addressed with improved memory handling. This issue is fixed in macOS Ventura 13.7.3, macOS Sequoia 15.3, macOS Sonoma 14.7.3. An app may be able to cause unexpected system termination or corrupt kernel memory.
{
"affected": [],
"aliases": [
"CVE-2025-24151"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-27T22:15:19Z",
"severity": "CRITICAL"
},
"details": "The issue was addressed with improved memory handling. This issue is fixed in macOS Ventura 13.7.3, macOS Sequoia 15.3, macOS Sonoma 14.7.3. An app may be able to cause unexpected system termination or corrupt kernel memory.",
"id": "GHSA-826g-p4h4-g7x3",
"modified": "2025-11-03T21:32:29Z",
"published": "2025-01-28T00:32:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-24151"
},
{
"type": "WEB",
"url": "https://support.apple.com/en-us/122068"
},
{
"type": "WEB",
"url": "https://support.apple.com/en-us/122069"
},
{
"type": "WEB",
"url": "https://support.apple.com/en-us/122070"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2025/Jan/15"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2025/Jan/16"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2025/Jan/17"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-82F9-P6MV-5RCX
Vulnerability from github – Published: 2022-01-20 00:02 – Updated: 2022-01-27 00:03An Uncontrolled Resource Consumption vulnerability in the kernel of Juniper Networks Junos OS allows an unauthenticated network based attacker to cause 100% CPU load and the device to become unresponsive by sending a flood of traffic to the out-of-band management ethernet port. Continued receipted of a flood will create a sustained Denial of Service (DoS) condition. Once the flood subsides the system will recover by itself. An indication that the system is affected by this issue would be that an irq handled by the fman process is shown to be using a high percentage of CPU cycles like in the following example output: user@host> show system processes extensive ... PID USERNAME PRI NICE SIZE RES STATE TIME WCPU COMMAND 31 root -84 -187 0K 16K WAIT 22.2H 56939.26% irq96: fman0 This issue affects Juniper Networks Junos OS: All versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S4; 19.4 versions prior to 19.4R2-S5, 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R2-S2, 20.4R3; 21.1 versions prior to 21.1R2; 21.2 versions prior to 21.2R1-S1, 21.2R2.
{
"affected": [],
"aliases": [
"CVE-2022-22161"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-01-19T01:15:00Z",
"severity": "HIGH"
},
"details": "An Uncontrolled Resource Consumption vulnerability in the kernel of Juniper Networks Junos OS allows an unauthenticated network based attacker to cause 100% CPU load and the device to become unresponsive by sending a flood of traffic to the out-of-band management ethernet port. Continued receipted of a flood will create a sustained Denial of Service (DoS) condition. Once the flood subsides the system will recover by itself. An indication that the system is affected by this issue would be that an irq handled by the fman process is shown to be using a high percentage of CPU cycles like in the following example output: user@host\u003e show system processes extensive ... PID USERNAME PRI NICE SIZE RES STATE TIME WCPU COMMAND 31 root -84 -187 0K 16K WAIT 22.2H 56939.26% irq96: fman0 This issue affects Juniper Networks Junos OS: All versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S4; 19.4 versions prior to 19.4R2-S5, 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R2-S2, 20.4R3; 21.1 versions prior to 21.1R2; 21.2 versions prior to 21.2R1-S1, 21.2R2.",
"id": "GHSA-82f9-p6mv-5rcx",
"modified": "2022-01-27T00:03:52Z",
"published": "2022-01-20T00:02:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-22161"
},
{
"type": "WEB",
"url": "https://kb.juniper.net/JSA11269"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-82HX-W2R5-C2WQ
Vulnerability from github – Published: 2022-02-15 01:57 – Updated: 2023-09-20 22:42The Kubernetes API server component in Kubernetes versions prior to 1.15.9, 1.16.0-1.16.6, and 1.17.0-1.17.2 has been found to be vulnerable to a denial of service attack via successful API requests.
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "k8s.io/apiserver"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.15.10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "k8s.io/apiserver"
},
"ranges": [
{
"events": [
{
"introduced": "0.16.0"
},
{
"fixed": "0.16.7"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "k8s.io/apiserver"
},
"ranges": [
{
"events": [
{
"introduced": "0.17.0"
},
{
"fixed": "0.17.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-8552"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-770",
"CWE-789"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-06T21:48:16Z",
"nvd_published_at": "2020-03-27T15:15:00Z",
"severity": "MODERATE"
},
"details": "The Kubernetes API server component in Kubernetes versions prior to 1.15.9, 1.16.0-1.16.6, and 1.17.0-1.17.2 has been found to be vulnerable to a denial of service attack via successful API requests.",
"id": "GHSA-82hx-w2r5-c2wq",
"modified": "2023-09-20T22:42:48Z",
"published": "2022-02-15T01:57:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8552"
},
{
"type": "WEB",
"url": "https://github.com/kubernetes/kubernetes/issues/89378"
},
{
"type": "WEB",
"url": "https://github.com/kubernetes/kubernetes/pull/87669"
},
{
"type": "WEB",
"url": "https://github.com/kubernetes/kubernetes/commit/5978856c4c7f10737a11c9540fe60b8475beecbb"
},
{
"type": "WEB",
"url": "https://groups.google.com/forum/#!topic/kubernetes-security-announce/2UOlsba2g0s"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3SOCLOPTSYABTE4CLTSPDIFE6ZZZR4LX"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20200413-0003"
}
],
"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": "Kubernetes API Server DoS Via API Requests"
}
GHSA-82JR-6MFR-9VQ5
Vulnerability from github – Published: 2026-08-26 00:30 – Updated: 2026-08-26 21:31Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120.
The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.
{
"affected": [],
"aliases": [
"CVE-2026-68763"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-25T22:17:05Z",
"severity": "HIGH"
},
"details": "Uncontrolled Resource Consumption vulnerability in Apache Tomcat\u00a0via an allocation leak in the HTTP/2 backlog tracking when a stream is reset\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120.\n\n\n\nThe following versions were EOL at the time the CVE was created but are \nknown to be affected: from 8.5.59 through 8.5.100.\u00a0Other unsupported versions may also be affected.\n\n\n\nUsers are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.",
"id": "GHSA-82jr-6mfr-9vq5",
"modified": "2026-08-26T21:31:39Z",
"published": "2026-08-26T00:30:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68763"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2026/08/26/9"
}
],
"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-82MP-3RRR-QPGM
Vulnerability from github – Published: 2026-04-06 21:31 – Updated: 2026-04-07 15:30An issue was discovered in L2 in Samsung Mobile Processor, Wearable Processor, and Modem Exynos 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, 1580, 2500, 9110, W920, W930, W1000, Modem 5123, Modem 5300, and Modem 5400. Incorrect handling of LTE MAC packets containing many MAC Control Elements (CEs) leads to baseband crashes.
{
"affected": [],
"aliases": [
"CVE-2025-58349"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-06T19:16:26Z",
"severity": "CRITICAL"
},
"details": "An issue was discovered in L2 in Samsung Mobile Processor, Wearable Processor, and Modem Exynos 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, 1580, 2500, 9110, W920, W930, W1000, Modem 5123, Modem 5300, and Modem 5400. Incorrect handling of LTE MAC packets containing many MAC Control Elements (CEs) leads to baseband crashes.",
"id": "GHSA-82mp-3rrr-qpgm",
"modified": "2026-04-07T15:30:46Z",
"published": "2026-04-06T21:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58349"
},
{
"type": "WEB",
"url": "https://semiconductor.samsung.com/support/quality-support/product-security-updates"
},
{
"type": "WEB",
"url": "https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2025-58349"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-82VF-7XG6-267X
Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 21:31Parrot AR.Drone version 1 and 2 does not employ a suitable mechanism to prevent denial-of-service (DoS) attacks. An attacker can harm the device availability (i.e., video streaming and control) by using tool to perform an IPv4 flood attack. Verified attacks includes SYN flooding and UDP flooding.
{
"affected": [],
"aliases": [
"CVE-2021-44320"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-04T18:17:44Z",
"severity": "HIGH"
},
"details": "Parrot AR.Drone version 1 and 2 does not employ a suitable mechanism to prevent denial-of-service (DoS) attacks. An attacker can harm the device availability (i.e., video streaming and control) by using tool to perform an IPv4 flood attack. Verified attacks includes SYN flooding and UDP flooding.",
"id": "GHSA-82vf-7xg6-267x",
"modified": "2026-09-04T21:31:49Z",
"published": "2026-09-04T18:31:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-44320"
},
{
"type": "WEB",
"url": "https://github.com/gubertoli/cve/tree/main/CVE-2021-44320"
},
{
"type": "WEB",
"url": "https://www.researchgate.net/publication/257681090_ARDrone_corruption"
},
{
"type": "WEB",
"url": "https://www.researchgate.net/publication/313177418_The_Impact_of_DoS_Attacks_on_the_ARDrone_20"
}
],
"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-82VR-GJVH-Q9R8
Vulnerability from github – Published: 2026-07-17 12:31 – Updated: 2026-07-17 12:31Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678
{
"affected": [],
"aliases": [
"CVE-2026-9602"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-17T11:17:15Z",
"severity": "MODERATE"
},
"details": "Mattermost Desktop App versions \u003c=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678",
"id": "GHSA-82vr-gjvh-q9r8",
"modified": "2026-07-17T12:31:30Z",
"published": "2026-07-17T12:31:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9602"
},
{
"type": "WEB",
"url": "https://mattermost.com/security-updates"
}
],
"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"
}
]
}
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.