Common Weakness Enumeration
CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
5422 vulnerabilities reference this CWE, most recent first.
CVE-2024-46891 (GCVE-0-2024-46891)
Vulnerability from cvelistv5 – Published: 2024-11-12 12:49 – Updated: 2024-11-12 14:25
VLAI
EPSS
VEX
Summary
A vulnerability has been identified in SINEC INS (All versions < V1.0 SP2 Update 3). The affected application does not properly restrict the size of generated log files. This could allow an unauthenticated remote attacker to trigger a large amount of logged events to exhaust the system's resources and create a denial of service condition.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
Impacted products
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CVE-2024-45736 (GCVE-0-2024-45736)
Vulnerability from cvelistv5 – Published: 2024-10-14 17:03 – Updated: 2025-02-28 11:03
VLAI
EPSS
VEX
Title
Improperly Formatted ‘INGEST_EVAL’ Parameter Crashes Splunk Daemon
Summary
In Splunk Enterprise versions below 9.3.1, 9.2.3, and 9.1.6 and Splunk Cloud Platform versions below 9.2.2403.107, 9.1.2312.204, and 9.1.2312.111, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a search query with an improperly formatted "INGEST_EVAL" parameter as part of a [Field Transformation](https://docs.splunk.com/Documentation/Splunk/latest/Knowledge/Managefieldtransforms) which could crash the Splunk daemon (splunkd).
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - The software does not properly control the allocation and maintenance of a limited resource thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
Assigner
References
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Splunk | Splunk Enterprise |
Affected:
9.3 , < 9.3.1
(custom)
Affected: 9.2 , < 9.2.3 (custom) Affected: 9.1 , < 9.1.6 (custom) |
|
| Splunk | Splunk Cloud Platform |
Affected:
9.2.2403 , < 9.2.2403.107
(custom)
Affected: 9.1.2312 , < 9.1.2312.204 (custom) Affected: 9.1.2312 , < 9.1.2312.111 (custom) |
|
| splunk | splunk_enterprise |
Affected:
9.3 , < 9.3.1
(custom)
Affected: 9.2 , < 9.2.3 (custom) Affected: 9.1 , < 9.1.6 (custom) cpe:2.3:a:splunk:splunk_enterprise:*:*:*:*:*:*:*:* |
|
| splunk | splunk_cloud_platform |
Affected:
9.2.2403 , < 9.2.2403.107
(custom)
Affected: 9.1.2312 , < 9.1.2312.204 (custom) Affected: 9.1.2312 , < 9.1.2312.111 (custom) cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:* |
Date Public
2024-10-14 00:00
Credits
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CVE-2024-45626 (GCVE-0-2024-45626)
Vulnerability from cvelistv5 – Published: 2025-02-06 11:21 – Updated: 2025-02-12 19:51
VLAI
EPSS
VEX
Title
Apache James: denial of service through JMAP HTML to text conversion
Summary
Apache James server JMAP HTML to text plain implementation in versions below 3.8.2 and 3.7.6 is subject to unbounded memory consumption that can result in a denial of service.
Users are recommended to upgrade to version 3.7.6 and 3.8.2, which fix this issue.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache James server |
Affected:
3.8.0 , ≤ 3.8.1
(maven)
Affected: 0 , ≤ 3.7.5 (maven) |
Credits
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CVE-2024-45420 (GCVE-0-2024-45420)
Vulnerability from cvelistv5 – Published: 2024-11-19 19:32 – Updated: 2024-11-20 15:16
VLAI
EPSS
VEX
Title
Zoom Apps - Uncontrolled Resource Consumption
Summary
Uncontrolled resource consumption in some Zoom Apps before version 6.2.0 may allow an authenticated user to conduct a denial of service via network access.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Zoom Communications Inc. | Zoom Workplace Apps, SDKs, Rooms Clients, and Rooms Controllers |
Affected:
see references
|
Date Public
2024-11-12 13:00
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CVE-2024-43806 (GCVE-0-2024-43806)
Vulnerability from cvelistv5 – Published: 2024-08-26 18:43 – Updated: 2024-08-26 19:40
VLAI
EPSS
VEX
Title
`rustix::fs::Dir` iterator with the `linux_raw` backend can cause memory explosion
Summary
Rustix is a set of safe Rust bindings to POSIX-ish APIs. When using `rustix::fs::Dir` using the `linux_raw` backend, it's possible for the iterator to "get stuck" when an IO error is encountered. Combined with a memory over-allocation issue in `rustix::fs::Dir::read_more`, this can cause quick and unbounded memory explosion (gigabytes in a few seconds if used on a hot path) and eventually lead to an OOM crash of the application. The symptoms were initially discovered in https://github.com/imsnif/bandwhich/issues/284. That post has lots of details of our investigation. Full details can be read on the GHSA-c827-hfw6-qwvm repo advisory. If a program tries to access a directory with its file descriptor after the file has been unlinked (or any other action that leaves the `Dir` iterator in the stuck state), and the implementation does not break after seeing an error, it can cause a memory explosion. As an example, Linux's various virtual file systems (e.g. `/proc`, `/sys`) can contain directories that spontaneously pop in and out of existence. Attempting to iterate over them using `rustix::fs::Dir` directly or indirectly (e.g. with the `procfs` crate) can trigger this fault condition if the implementation decides to continue on errors. An attacker knowledgeable about the implementation details of a vulnerable target can therefore try to trigger this fault condition via any one or a combination of several available APIs. If successful, the application host will quickly run out of memory, after which the application will likely be terminated by an OOM killer, leading to denial of service. This issue has been addressed in release versions 0.35.15, 0.36.16, 0.37.25, and 0.38.19. Users are advised to upgrade. There are no known workarounds for this issue.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/rustix/securi… | x_refsource_CONFIRM |
| https://github.com/imsnif/bandwhich/issues/284 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | rustix |
Affected:
>= 0.35.11, < 0.35.15
Affected: >= 0.36.0, < 0.36.16 Affected: >= 0.37.0, < 0.37.25 Affected: >= 0.38.0, < 0.38.19 |
|
| bytecodealliance | rustix |
Affected:
0.35.11 , < 0.35.15
(custom)
Affected: 0.36.0 , < 0.36.16 (custom) Affected: 0.37.0 , < 0.37.25 (custom) Affected: 0.38.0 , < 0.38.19 (custom) cpe:2.3:a:bytecodealliance:rustix:*:*:*:*:*:*:*:* |
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CVE-2024-43789 (GCVE-0-2024-43789)
Vulnerability from cvelistv5 – Published: 2024-10-07 20:24 – Updated: 2024-10-08 18:11
VLAI
EPSS
VEX
Title
Denial of service by the absence of restrictions on replies to posts in Discourse
Summary
Discourse is an open source platform for community discussion. A user can create a post with many replies, and then attempt to fetch them all at once. This can potentially reduce the availability of a Discourse instance. This problem has been patched in the latest version of Discourse. All users area are advised to upgrade. There are no known workarounds for this vulnerability.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/discourse/discourse/security/a… | x_refsource_CONFIRM |
Impacted products
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CVE-2024-43647 (GCVE-0-2024-43647)
Vulnerability from cvelistv5 – Published: 2024-09-10 09:36 – Updated: 2024-09-10 14:52
VLAI
EPSS
VEX
Summary
A vulnerability has been identified in SIMATIC S7-200 SMART CPU CR40 (6ES7288-1CR40-0AA0) (All versions), SIMATIC S7-200 SMART CPU CR60 (6ES7288-1CR60-0AA0) (All versions), SIMATIC S7-200 SMART CPU SR20 (6ES7288-1SR20-0AA0) (All versions), SIMATIC S7-200 SMART CPU SR20 (6ES7288-1SR20-0AA1) (All versions), SIMATIC S7-200 SMART CPU SR30 (6ES7288-1SR30-0AA0) (All versions), SIMATIC S7-200 SMART CPU SR30 (6ES7288-1SR30-0AA1) (All versions), SIMATIC S7-200 SMART CPU SR40 (6ES7288-1SR40-0AA0) (All versions), SIMATIC S7-200 SMART CPU SR40 (6ES7288-1SR40-0AA1) (All versions), SIMATIC S7-200 SMART CPU SR60 (6ES7288-1SR60-0AA0) (All versions), SIMATIC S7-200 SMART CPU SR60 (6ES7288-1SR60-0AA1) (All versions), SIMATIC S7-200 SMART CPU ST20 (6ES7288-1ST20-0AA0) (All versions), SIMATIC S7-200 SMART CPU ST20 (6ES7288-1ST20-0AA1) (All versions), SIMATIC S7-200 SMART CPU ST30 (6ES7288-1ST30-0AA0) (All versions), SIMATIC S7-200 SMART CPU ST30 (6ES7288-1ST30-0AA1) (All versions), SIMATIC S7-200 SMART CPU ST40 (6ES7288-1ST40-0AA0) (All versions), SIMATIC S7-200 SMART CPU ST40 (6ES7288-1ST40-0AA1) (All versions), SIMATIC S7-200 SMART CPU ST60 (6ES7288-1ST60-0AA0) (All versions), SIMATIC S7-200 SMART CPU ST60 (6ES7288-1ST60-0AA1) (All versions). Affected devices do not properly handle TCP packets with an incorrect structure. This could allow an unauthenticated remote attacker to cause a denial of service condition. To restore normal operations, the network cable of the device needs to be unplugged and re-plugged.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
11 products
| Vendor | Product | Version | |
|---|---|---|---|
| Siemens | SIMATIC S7-200 SMART CPU CR40 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU CR60 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU SR20 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU SR30 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU SR40 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU SR60 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU ST20 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU ST30 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU ST40 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-200 SMART CPU ST60 |
Affected:
0 , < *
(custom)
|
|
| siemens | simatic_s7-200_smart_cpu_st60 |
Affected:
0 , < *
(custom)
cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_cr20s:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_cr30s:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_cr40:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_cr40s:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_cr60:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_cr60s:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_sr20:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_sr30:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_sr40:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_sr60:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_st20:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_st30:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_st40:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:simatic_s7-200_smart_cpu_st60:-:*:*:*:*:*:*:* |
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CVE-2024-43575 (GCVE-0-2024-43575)
Vulnerability from cvelistv5 – Published: 2024-10-08 17:36 – Updated: 2026-06-09 18:29
VLAI
EPSS
VEX
Title
Windows Hyper-V Denial of Service Vulnerability
Summary
Windows Hyper-V Denial of Service Vulnerability
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows Server 2016 |
Affected:
10.0.14393.0 , < 10.0.14393.7428
(custom)
|
|
| Microsoft | Windows Server 2016 (Server Core installation) |
Affected:
10.0.14393.0 , < 10.0.14393.7428
(custom)
|
|
| Microsoft | Windows Server 2019 |
Affected:
10.0.17763.0 , < 10.0.17763.6414
(custom)
|
|
| Microsoft | Windows Server 2019 (Server Core installation) |
Affected:
10.0.17763.0 , < 10.0.17763.6414
(custom)
|
|
| Microsoft | Windows Server 2022 |
Affected:
10.0.20348.0 , < 10.0.20348.2762
(custom)
|
|
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) |
Affected:
10.0.25398.0 , < 10.0.25398.1189
(custom)
|
Date Public
2024-10-08 07:00
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CVE-2024-43545 (GCVE-0-2024-43545)
Vulnerability from cvelistv5 – Published: 2024-10-08 17:35 – Updated: 2026-06-09 18:28
VLAI
EPSS
VEX
Title
Windows Online Certificate Status Protocol (OCSP) Server Denial of Service Vulnerability
Summary
Windows Online Certificate Status Protocol (OCSP) Server Denial of Service Vulnerability
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
15 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows Server 2008 Service Pack 2 |
Affected:
6.0.6003.0 , < 6.0.6003.22918
(custom)
|
|
| Microsoft | Windows Server 2008 R2 Service Pack 1 |
Affected:
6.1.7601.0 , < 6.1.7601.27366
(custom)
|
|
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) |
Affected:
6.1.7601.0 , < 6.1.7601.27366
(custom)
|
|
| Microsoft | Windows Server 2008 Service Pack 2 |
Affected:
6.0.6003.0 , < 6.0.6003.22918
(custom)
|
|
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) |
Affected:
6.0.6003.0 , < 6.0.6003.22918
(custom)
|
|
| Microsoft | Windows Server 2012 |
Affected:
6.2.9200.0 , < 6.2.9200.25118
(custom)
|
|
| Microsoft | Windows Server 2012 (Server Core installation) |
Affected:
6.2.9200.0 , < 6.2.9200.25118
(custom)
|
|
| Microsoft | Windows Server 2012 R2 |
Affected:
6.3.9600.0 , < 6.3.9600.22221
(custom)
|
|
| Microsoft | Windows Server 2012 R2 (Server Core installation) |
Affected:
6.3.9600.0 , < 6.3.9600.22221
(custom)
|
|
| Microsoft | Windows Server 2016 |
Affected:
10.0.14393.0 , < 10.0.14393.7428
(custom)
|
|
| Microsoft | Windows Server 2016 (Server Core installation) |
Affected:
10.0.14393.0 , < 10.0.14393.7428
(custom)
|
|
| Microsoft | Windows Server 2019 |
Affected:
10.0.17763.0 , < 10.0.17763.6414
(custom)
|
|
| Microsoft | Windows Server 2019 (Server Core installation) |
Affected:
10.0.17763.0 , < 10.0.17763.6414
(custom)
|
|
| Microsoft | Windows Server 2022 |
Affected:
10.0.20348.0 , < 10.0.20348.2762
(custom)
|
|
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) |
Affected:
10.0.25398.0 , < 10.0.25398.1189
(custom)
|
Date Public
2024-10-08 07:00
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CVE-2024-43544 (GCVE-0-2024-43544)
Vulnerability from cvelistv5 – Published: 2024-10-08 17:35 – Updated: 2026-06-09 18:28
VLAI
EPSS
VEX
Title
Microsoft Simple Certificate Enrollment Protocol Denial of Service Vulnerability
Summary
Microsoft Simple Certificate Enrollment Protocol Denial of Service Vulnerability
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
15 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows Server 2008 Service Pack 2 |
Affected:
6.0.6003.0 , < 6.0.6003.22918
(custom)
|
|
| Microsoft | Windows Server 2008 R2 Service Pack 1 |
Affected:
6.1.7601.0 , < 6.1.7601.27366
(custom)
|
|
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) |
Affected:
6.1.7601.0 , < 6.1.7601.27366
(custom)
|
|
| Microsoft | Windows Server 2008 Service Pack 2 |
Affected:
6.0.6003.0 , < 6.0.6003.22918
(custom)
|
|
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) |
Affected:
6.0.6003.0 , < 6.0.6003.22918
(custom)
|
|
| Microsoft | Windows Server 2012 |
Affected:
6.2.9200.0 , < 6.2.9200.25118
(custom)
|
|
| Microsoft | Windows Server 2012 (Server Core installation) |
Affected:
6.2.9200.0 , < 6.2.9200.25118
(custom)
|
|
| Microsoft | Windows Server 2012 R2 |
Affected:
6.3.9600.0 , < 6.3.9600.22221
(custom)
|
|
| Microsoft | Windows Server 2012 R2 (Server Core installation) |
Affected:
6.3.9600.0 , < 6.3.9600.22221
(custom)
|
|
| Microsoft | Windows Server 2016 |
Affected:
10.0.14393.0 , < 10.0.14393.7428
(custom)
|
|
| Microsoft | Windows Server 2016 (Server Core installation) |
Affected:
10.0.14393.0 , < 10.0.14393.7428
(custom)
|
|
| Microsoft | Windows Server 2019 |
Affected:
10.0.17763.0 , < 10.0.17763.6414
(custom)
|
|
| Microsoft | Windows Server 2019 (Server Core installation) |
Affected:
10.0.17763.0 , < 10.0.17763.6414
(custom)
|
|
| Microsoft | Windows Server 2022 |
Affected:
10.0.20348.0 , < 10.0.20348.2762
(custom)
|
|
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) |
Affected:
10.0.25398.0 , < 10.0.25398.1189
(custom)
|
Date Public
2024-10-08 07:00
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"product": "Windows Server 2019",
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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.