CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
5419 vulnerabilities reference this CWE, most recent first.
GHSA-MXWX-46P7-HCM6
Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-07-03 18:42In the Linux kernel, the following vulnerability has been resolved:
cpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init
It's a classic example of memleak, we allocate something, we fail and never free the resources.
Make sure we free all resources on policy ->init() failures.
{
"affected": [],
"aliases": [
"CVE-2021-47313"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:18Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init\n\nIt\u0027s a classic example of memleak, we allocate something, we fail and\nnever free the resources.\n\nMake sure we free all resources on policy -\u003einit() failures.",
"id": "GHSA-mxwx-46p7-hcm6",
"modified": "2024-07-03T18:42:45Z",
"published": "2024-05-21T15:31:42Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47313"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b775383355755885b19d2acef977f1ca132e80a3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e1b2b2b61d30d7ce057ec17237c217d152ed97f2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fe2535a44904a77615a3af8e8fd7dafb98fb0e1b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-P224-82HJ-42W3
Vulnerability from github – Published: 2024-12-12 03:33 – Updated: 2024-12-12 03:33Windows Remote Desktop Services Denial of Service Vulnerability
{
"affected": [],
"aliases": [
"CVE-2024-49075"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-12-12T02:04:31Z",
"severity": "HIGH"
},
"details": "Windows Remote Desktop Services\u00a0Denial of Service Vulnerability",
"id": "GHSA-p224-82hj-42w3",
"modified": "2024-12-12T03:33:04Z",
"published": "2024-12-12T03:33:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49075"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49075"
}
],
"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-P24H-HWF4-VP9H
Vulnerability from github – Published: 2022-05-24 17:21 – Updated: 2022-05-24 17:21An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. It allows attackers to cause a denial of service (memory consumption) via OpenGraph.
{
"affected": [],
"aliases": [
"CVE-2019-20880"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-06-19T17:15:00Z",
"severity": "MODERATE"
},
"details": "An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. It allows attackers to cause a denial of service (memory consumption) via OpenGraph.",
"id": "GHSA-p24h-hwf4-vp9h",
"modified": "2022-05-24T17:21:14Z",
"published": "2022-05-24T17:21:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20880"
},
{
"type": "WEB",
"url": "https://mattermost.com/security-updates"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-P24M-863F-FM6Q
Vulnerability from github – Published: 2023-02-15 17:42 – Updated: 2024-10-28 14:38Summary
The request body parsing in starlite allows a potentially unauthenticated
attacker to consume a large amount of CPU time and RAM.
Details
The multipart body parser processes an unlimited number of file parts. The multipart body parser processes an unlimited number of field parts.
Impact
This is a remote, potentially unauthenticated Denial of Service vulnerability.
This vulnerability affects applications with a request handler that accepts
a Body(media_type=RequestEncodingType.MULTI_PART).
The large amount of CPU time required for processing requests can block all available worker processes and significantly delay or slow down the processing of legitimate user requests. The large amount of RAM accumulated while processing requests can lead to Out-Of-Memory kills. Complete DoS is achievable by sending many concurrent multipart requests in a loop.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "starlite"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.51.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-25578"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-770"
],
"github_reviewed": true,
"github_reviewed_at": "2023-02-15T17:42:42Z",
"nvd_published_at": "2023-02-15T15:15:00Z",
"severity": "HIGH"
},
"details": "### Summary\n\nThe request body parsing in `starlite` allows a potentially unauthenticated\n attacker to consume a large amount of CPU time and RAM.\n\n### Details\n\nThe multipart body parser processes an unlimited number of file parts.\nThe multipart body parser processes an unlimited number of field parts.\n\n### Impact\n\nThis is a remote, potentially unauthenticated Denial of Service vulnerability.\n\nThis vulnerability affects applications with a request handler that accepts\n a `Body(media_type=RequestEncodingType.MULTI_PART)`.\n\nThe large amount of CPU time required for processing requests can block all\n available worker processes and significantly delay or slow down the processing\n of legitimate user requests.\nThe large amount of RAM accumulated while processing requests can lead to\n Out-Of-Memory kills.\nComplete DoS is achievable by sending many concurrent multipart requests in a\n loop.\n",
"id": "GHSA-p24m-863f-fm6q",
"modified": "2024-10-28T14:38:20Z",
"published": "2023-02-15T17:42:42Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/starlite-api/starlite/security/advisories/GHSA-p24m-863f-fm6q"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-25578"
},
{
"type": "WEB",
"url": "https://github.com/starlite-api/starlite/commit/9674fe803628f986c03fe60769048cbc55b5bf83"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlite/PYSEC-2023-49.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/starlite-api/starlite"
},
{
"type": "WEB",
"url": "https://github.com/starlite-api/starlite/releases/tag/v1.51.2"
}
],
"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:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Denial of service vulnerability when parsing multipart request body"
}
GHSA-P28H-CC7Q-C4FG
Vulnerability from github – Published: 2022-10-01 00:00 – Updated: 2025-05-20 21:02The package css-what before 2.1.3 is vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "css-what"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2022-21222"
],
"database_specific": {
"cwe_ids": [
"CWE-1333",
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2022-10-04T21:11:32Z",
"nvd_published_at": "2022-09-30T05:15:00Z",
"severity": "HIGH"
},
"details": "The package css-what before 2.1.3 is vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of insecure regular expression in the `re_attr` variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.",
"id": "GHSA-p28h-cc7q-c4fg",
"modified": "2025-05-20T21:02:33Z",
"published": "2022-10-01T00:00:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-21222"
},
{
"type": "WEB",
"url": "https://github.com/fb55/css-what/commit/dc510929790da6617e7aa93a616498b22f6a6b72"
},
{
"type": "PACKAGE",
"url": "https://github.com/fb55/css-what"
},
{
"type": "WEB",
"url": "https://github.com/fb55/css-what/blob/a38effd5a8f5506d75c7f8f13cbd8c76248a3860/index.js#23L12"
},
{
"type": "WEB",
"url": "https://github.com/fb55/css-what/blob/a38effd5a8f5506d75c7f8f13cbd8c76248a3860/index.js%23L12"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00001.html"
},
{
"type": "WEB",
"url": "https://security.snyk.io/vuln/SNYK-JS-CSSWHAT-3035488"
}
],
"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": "css-what vulnerable to ReDoS due to use of insecure regular expression"
}
GHSA-P297-MW3M-XX2C
Vulnerability from github – Published: 2025-09-04 21:31 – Updated: 2025-09-04 21:31In validateIpConfiguration of WifiConfigurationUtil.java, there is a possible way to trigger a permanent DoS due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
{
"affected": [],
"aliases": [
"CVE-2025-26423"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-04T18:15:40Z",
"severity": "MODERATE"
},
"details": "In validateIpConfiguration of WifiConfigurationUtil.java, there is a possible way to trigger a permanent DoS due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.",
"id": "GHSA-p297-mw3m-xx2c",
"modified": "2025-09-04T21:31:37Z",
"published": "2025-09-04T21:31:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26423"
},
{
"type": "WEB",
"url": "https://android.googlesource.com/platform/packages/modules/Wifi/+/01e708a7a9af970b3aa40cdca2cbde71d07a859b"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/2025-05-01"
}
],
"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-P2F2-947H-8Q6C
Vulnerability from github – Published: 2025-08-18 21:31 – Updated: 2025-08-18 21:31TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow in the url parameter at /boafrm/formFilter. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.
{
"affected": [],
"aliases": [
"CVE-2025-55586"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-08-18T20:15:30Z",
"severity": "HIGH"
},
"details": "TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow in the url parameter at /boafrm/formFilter. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.",
"id": "GHSA-p2f2-947h-8q6c",
"modified": "2025-08-18T21:31:21Z",
"published": "2025-08-18T21:31:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55586"
},
{
"type": "WEB",
"url": "https://github.com/goldenGlow21/softwares_PoC/blob/main/A3002R_V4/Boa%20-%20BOF/formFilter%20PoC.md"
}
],
"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-P2G7-XWVR-RRW3
Vulnerability from github – Published: 2022-09-16 18:49 – Updated: 2022-09-16 18:49Helm controller is tightly integrated with the Helm SDK. A vulnerability found in the Helm SDK allows for specific data inputs to cause high memory consumption, which in some platforms could cause the controller to panic and stop processing reconciliations.
Impact
In a shared cluster multi-tenancy environment, a tenant could create a HelmRelease that makes the controller panic, denying all other tenants from their Helm releases being reconciled.
Credits
The initial crash bug was reported by oss-fuzz. The Flux Security team produced the first exploit and worked together with the Helm Security team to ensure that both projects were patched timely.
For more information
If you have any questions or comments about this advisory: - Open an issue in any of the affected repositories. - Contact us at the CNCF Flux Channel.
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=48360
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=44996
- https://github.com/helm/helm/security/advisories/GHSA-7hfp-qfw3-5jxh
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/fluxcd/helm-controller"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.4"
},
{
"fixed": "0.23.0"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/fluxcd/flux2"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.17"
},
{
"fixed": "0.32.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2022-36049"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-770"
],
"github_reviewed": true,
"github_reviewed_at": "2022-09-16T18:49:48Z",
"nvd_published_at": "2022-09-07T21:15:00Z",
"severity": "HIGH"
},
"details": "Helm controller is tightly integrated with the Helm SDK. [A vulnerability](https://github.com/helm/helm/security/advisories/GHSA-7hfp-qfw3-5jxh) found in the Helm SDK allows for specific data inputs to cause high memory consumption, which in some platforms could cause the controller to panic and stop processing reconciliations.\n\n### Impact\nIn a shared cluster multi-tenancy environment, a tenant could create a HelmRelease that makes the controller panic, denying all other tenants from their Helm releases being reconciled.\n\n### Credits\n\nThe initial crash bug was reported by [oss-fuzz](https://github.com/google/oss-fuzz). The Flux Security team produced the first exploit and worked together with the Helm Security team to ensure that both projects were patched timely.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n- Open an issue in any of the affected repositories.\n- Contact us at the CNCF Flux Channel.\n\n### References\n\n- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=48360\n- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=44996\n- https://github.com/helm/helm/security/advisories/GHSA-7hfp-qfw3-5jxh\n",
"id": "GHSA-p2g7-xwvr-rrw3",
"modified": "2022-09-16T18:49:48Z",
"published": "2022-09-16T18:49:48Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/fluxcd/flux2/security/advisories/GHSA-p2g7-xwvr-rrw3"
},
{
"type": "WEB",
"url": "https://github.com/helm/helm/security/advisories/GHSA-7hfp-qfw3-5jxh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-36049"
},
{
"type": "WEB",
"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=44996"
},
{
"type": "WEB",
"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=48360"
},
{
"type": "PACKAGE",
"url": "https://github.com/fluxcd/flux2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Helm Controller denial of service"
}
GHSA-P2G9-FJ77-VP3R
Vulnerability from github – Published: 2022-12-25 00:30 – Updated: 2022-12-31 00:30Brave Browser before 1.43.88 allowed a remote attacker to cause a denial of service in private and guest windows via a crafted HTML file that mentions an ipfs:// or ipns:// URL. This is caused by an incomplete fix for CVE-2022-47932 and CVE-2022-47934.
{
"affected": [],
"aliases": [
"CVE-2022-47934"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-12-24T22:15:00Z",
"severity": "MODERATE"
},
"details": "Brave Browser before 1.43.88 allowed a remote attacker to cause a denial of service in private and guest windows via a crafted HTML file that mentions an ipfs:// or ipns:// URL. This is caused by an incomplete fix for CVE-2022-47932 and CVE-2022-47934.",
"id": "GHSA-p2g9-fj77-vp3r",
"modified": "2022-12-31T00:30:23Z",
"published": "2022-12-25T00:30:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-47934"
},
{
"type": "WEB",
"url": "https://github.com/brave/brave-browser/issues/24211"
},
{
"type": "WEB",
"url": "https://github.com/brave/brave-browser/issues/25106"
},
{
"type": "WEB",
"url": "https://github.com/brave/brave-core/pull/14313"
},
{
"type": "WEB",
"url": "https://github.com/brave/brave-core/commit/82d8e39043e691e0492519126437275511ee87e8"
},
{
"type": "WEB",
"url": "https://hackerone.com/reports/1646204"
}
],
"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-P2GH-CFQ4-4WJC
Vulnerability from github – Published: 2026-03-25 21:02 – Updated: 2026-04-16 22:59Impact
A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.
Patches
Patches have been released to 5.34.0-RC1 and 4.33.6.
{
"affected": [
{
"package": {
"ecosystem": "Packagist",
"name": "google/protobuf"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.33.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-6409"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-25T21:02:08Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Impact\nA Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages\u2014specifically those containing negative `varint`s or deep recursion\u2014can be used to crash the application, impacting service availability.\n\n### Patches\nPatches have been released to 5.34.0-RC1 and 4.33.6.",
"id": "GHSA-p2gh-cfq4-4wjc",
"modified": "2026-04-16T22:59:37Z",
"published": "2026-03-25T21:02:08Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6409"
},
{
"type": "WEB",
"url": "https://github.com/protocolbuffers/protobuf/issues/24159"
},
{
"type": "WEB",
"url": "https://github.com/protocolbuffers/protobuf/issues/25067"
},
{
"type": "WEB",
"url": "https://github.com/protocolbuffers/protobuf/commit/60e93d2d104f2af9cd345b1c6f3891d91430244a"
},
{
"type": "WEB",
"url": "https://github.com/protocolbuffers/protobuf/commit/c8e9b27d95c6ab2d0668b5889e7dac2c477b7038"
},
{
"type": "PACKAGE",
"url": "https://github.com/protocolbuffers/protobuf"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Protobuf: Denial of Service issue through malicious messages containing negative varints or deep recursion"
}
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.