CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
5626 vulnerabilities reference this CWE, most recent first.
GHSA-4V4G-VFV9-GVGJ
Vulnerability from github – Published: 2025-10-14 18:30 – Updated: 2025-10-14 18:30Uncontrolled resource consumption in Windows Remote Procedure Call allows an unauthorized attacker to deny service over a network.
{
"affected": [],
"aliases": [
"CVE-2025-59502"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-14T17:16:14Z",
"severity": "HIGH"
},
"details": "Uncontrolled resource consumption in Windows Remote Procedure Call allows an unauthorized attacker to deny service over a network.",
"id": "GHSA-4v4g-vfv9-gvgj",
"modified": "2025-10-14T18:30:36Z",
"published": "2025-10-14T18:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59502"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59502"
}
],
"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-4V4M-HGV5-X3QX
Vulnerability from github – Published: 2022-05-24 17:45 – Updated: 2024-04-04 03:05A flaw was found in Undertow when using Remoting as shipped in Red Hat Jboss EAP before version 7.2.4. A memory leak in HttpOpenListener due to holding remote connections indefinitely may lead to denial of service. Versions before undertow 2.0.25.SP1 and jboss-remoting 5.0.14.SP1 are believed to be vulnerable.
{
"affected": [],
"aliases": [
"CVE-2019-19343"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-404"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-03-23T21:15:00Z",
"severity": "HIGH"
},
"details": "A flaw was found in Undertow when using Remoting as shipped in Red Hat Jboss EAP before version 7.2.4. A memory leak in HttpOpenListener due to holding remote connections indefinitely may lead to denial of service. Versions before undertow 2.0.25.SP1 and jboss-remoting 5.0.14.SP1 are believed to be vulnerable.",
"id": "GHSA-4v4m-hgv5-x3qx",
"modified": "2024-04-04T03:05:16Z",
"published": "2022-05-24T17:45:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-19343"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1780445"
},
{
"type": "WEB",
"url": "https://issues.redhat.com/browse/JBEAP-16695"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20220211-0002"
}
],
"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-4V5G-XJVW-59G6
Vulnerability from github – Published: 2023-12-28 18:30 – Updated: 2024-08-07 18:30An issue was found in the tiffcp utility distributed by the libtiff package where a crafted TIFF file on processing may cause a heap-based buffer overflow leads to an application crash.
{
"affected": [],
"aliases": [
"CVE-2023-6228"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-12-18T14:15:11Z",
"severity": "MODERATE"
},
"details": "An issue was found in the tiffcp utility distributed by the libtiff package where a crafted TIFF file on processing may cause a heap-based buffer overflow leads to an application crash.",
"id": "GHSA-4v5g-xjvw-59g6",
"modified": "2024-08-07T18:30:38Z",
"published": "2023-12-28T18:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-6228"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:2289"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:5079"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2023-6228"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2240995"
}
],
"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"
}
]
}
GHSA-4V7W-JQ2V-52PW
Vulnerability from github – Published: 2022-05-14 01:45 – Updated: 2025-04-20 03:39A Resource Exhaustion issue was discovered in Schneider Electric Modicon M340 PLC BMXNOC0401, BMXNOE0100, BMXNOE0110, BMXNOE0110H, BMXNOR0200H, BMXP341000, BMXP342000, BMXP3420102, BMXP3420102CL, BMXP342020, BMXP342020H, BMXP342030, BMXP3420302, BMXP3420302H, and BMXP342030H. A remote attacker could send a specially crafted set of packets to the PLC causing it to freeze, requiring the operator to physically press the reset button on the PLC in order to recover.
{
"affected": [],
"aliases": [
"CVE-2017-6017"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-06-30T03:29:00Z",
"severity": "HIGH"
},
"details": "A Resource Exhaustion issue was discovered in Schneider Electric Modicon M340 PLC BMXNOC0401, BMXNOE0100, BMXNOE0110, BMXNOE0110H, BMXNOR0200H, BMXP341000, BMXP342000, BMXP3420102, BMXP3420102CL, BMXP342020, BMXP342020H, BMXP342030, BMXP3420302, BMXP3420302H, and BMXP342030H. A remote attacker could send a specially crafted set of packets to the PLC causing it to freeze, requiring the operator to physically press the reset button on the PLC in order to recover.",
"id": "GHSA-4v7w-jq2v-52pw",
"modified": "2025-04-20T03:39:42Z",
"published": "2022-05-14T01:45:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-6017"
},
{
"type": "WEB",
"url": "https://ics-cert.us-cert.gov/advisories/ICSA-17-054-03"
},
{
"type": "WEB",
"url": "https://www.schneider-electric.com/en/download/document/SEVD-2017-048-02"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/96414"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-4V7X-PQXF-CX7M
Vulnerability from github – Published: 2024-04-04 21:30 – Updated: 2025-11-04 22:15An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "net/http"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "golang.org/x/net/http2"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.23.0"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "net/http"
},
"ranges": [
{
"events": [
{
"introduced": "1.22.0-0"
},
{
"fixed": "1.22.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "golang.org/x/net"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.23.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-45288"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2024-04-04T23:02:57Z",
"nvd_published_at": "2024-04-04T21:15:16Z",
"severity": "MODERATE"
},
"details": "An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request\u0027s headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.",
"id": "GHSA-4v7x-pqxf-cx7m",
"modified": "2025-11-04T22:15:09Z",
"published": "2024-04-04T21:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-45288"
},
{
"type": "WEB",
"url": "https://go.dev/cl/576155"
},
{
"type": "WEB",
"url": "https://go.dev/issue/65051"
},
{
"type": "WEB",
"url": "https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT"
},
{
"type": "WEB",
"url": "https://nowotarski.info/http2-continuation-flood-technical-details"
},
{
"type": "WEB",
"url": "https://pkg.go.dev/vuln/GO-2024-2687"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20240419-0009"
},
{
"type": "WEB",
"url": "https://www.kb.cert.org/vuls/id/421644"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/04/03/16"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/04/05/4"
}
],
"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": "net/http, x/net/http2: close connections when receiving too many headers"
}
GHSA-4V9J-MHHP-7QMP
Vulnerability from github – Published: 2022-05-13 01:24 – Updated: 2022-05-13 01:24The Performance Events subsystem in the Linux kernel before 3.1 does not properly handle event overflows associated with PERF_COUNT_SW_CPU_CLOCK events, which allows local users to cause a denial of service (system hang) via a crafted application.
{
"affected": [],
"aliases": [
"CVE-2011-2918"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2012-05-24T23:55:00Z",
"severity": "MODERATE"
},
"details": "The Performance Events subsystem in the Linux kernel before 3.1 does not properly handle event overflows associated with PERF_COUNT_SW_CPU_CLOCK events, which allows local users to cause a denial of service (system hang) via a crafted application.",
"id": "GHSA-4v9j-mhhp-7qmp",
"modified": "2022-05-13T01:24:57Z",
"published": "2022-05-13T01:24:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-2918"
},
{
"type": "WEB",
"url": "https://github.com/torvalds/linux/commit/a8b0ca17b80e92faab46ee7179ba9e99ccb61233"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=730706"
},
{
"type": "WEB",
"url": "http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a8b0ca17b80e92faab46ee7179ba9e99ccb61233"
},
{
"type": "WEB",
"url": "http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a8b0ca17b80e92faab46ee7179ba9e99ccb61233"
},
{
"type": "WEB",
"url": "http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2011/08/16/1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-4VM5-R6M3-2448
Vulnerability from github – Published: 2025-03-20 12:32 – Updated: 2025-03-20 12:32A vulnerability in danswer-ai/danswer v0.3.94 allows an attacker to cause a Denial of Service (DoS) by uploading a file with a malformed multipart boundary. By appending a large number of characters to the end of the multipart boundary, the server continuously processes each character, rendering the application inaccessible. This issue can be exploited by sending a single crafted request, affecting all users on the server.
{
"affected": [],
"aliases": [
"CVE-2024-8028"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-770"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-03-20T10:15:39Z",
"severity": "HIGH"
},
"details": "A vulnerability in danswer-ai/danswer v0.3.94 allows an attacker to cause a Denial of Service (DoS) by uploading a file with a malformed multipart boundary. By appending a large number of characters to the end of the multipart boundary, the server continuously processes each character, rendering the application inaccessible. This issue can be exploited by sending a single crafted request, affecting all users on the server.",
"id": "GHSA-4vm5-r6m3-2448",
"modified": "2025-03-20T12:32:47Z",
"published": "2025-03-20T12:32:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-8028"
},
{
"type": "WEB",
"url": "https://huntr.com/bounties/55530ecb-0ac2-4dc1-9527-bf24de594a57"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-4VMX-R9FJ-4CM5
Vulnerability from github – Published: 2026-02-18 18:30 – Updated: 2026-02-19 21:30In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a malicious payload into the realname, tz, or email parameters of the /splunkd/__raw/services/authentication/users/username REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.
{
"affected": [],
"aliases": [
"CVE-2026-20139"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-02-18T18:24:26Z",
"severity": "MODERATE"
},
"details": "In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the \"admin\" or \"power\" Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client\u2011side denial\u2011of\u2011service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.",
"id": "GHSA-4vmx-r9fj-4cm5",
"modified": "2026-02-19T21:30:44Z",
"published": "2026-02-18T18:30:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20139"
},
{
"type": "WEB",
"url": "https://advisory.splunk.com/advisories/SVD-2026-0204"
}
],
"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:L",
"type": "CVSS_V3"
}
]
}
GHSA-4VVG-656R-C25J
Vulnerability from github – Published: 2022-05-13 01:02 – Updated: 2024-11-18 16:26Specially crafted PROFINET DCP broadcast packets could cause a denial of service condition of affected products on a local Ethernet segment (Layer 2). Human interaction is required to recover the systems. PROFIBUS interfaces are not affected.
{
"affected": [],
"aliases": [
"CVE-2017-2680"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-05-11T01:29:00Z",
"severity": "HIGH"
},
"details": "Specially crafted PROFINET DCP broadcast packets could cause a denial of service condition of affected products on a local Ethernet segment (Layer 2). Human interaction is required to recover the systems. PROFIBUS interfaces are not affected.",
"id": "GHSA-4vvg-656r-c25j",
"modified": "2024-11-18T16:26:20Z",
"published": "2022-05-13T01:02:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-2680"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-284673.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-293562.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-546832.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-284673.pdf"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-293562.pdf"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-546832.pdf"
},
{
"type": "WEB",
"url": "https://ics-cert.us-cert.gov/advisories/ICSA-18-023-02"
},
{
"type": "WEB",
"url": "https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-284673.pdf"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/98369"
},
{
"type": "WEB",
"url": "http://www.securitytracker.com/id/1038463"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-4VWX-53CP-QMH4
Vulnerability from github – Published: 2025-01-15 18:30 – Updated: 2025-01-16 18:30An issue in XINJE XL5E-16T V3.7.2a allows attackers to cause a Denial of Service (DoS) via a crafted Modbus message.
{
"affected": [],
"aliases": [
"CVE-2024-50953"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-862"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-15T17:15:16Z",
"severity": "HIGH"
},
"details": "An issue in XINJE XL5E-16T V3.7.2a allows attackers to cause a Denial of Service (DoS) via a crafted Modbus message.",
"id": "GHSA-4vwx-53cp-qmh4",
"modified": "2025-01-16T18:30:59Z",
"published": "2025-01-15T18:30:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50953"
},
{
"type": "WEB",
"url": "https://github.com/Curator-Kim/Vulnerability-mining/blob/master/XINJE%20XL5E-16T%20Modbus/XINJE%20XL5E-16T%20Modbus%20DoS.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"
}
]
}
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.