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.
5475 vulnerabilities reference this CWE, most recent first.
CVE-2021-0233 (GCVE-0-2021-0233)
Vulnerability from cvelistv5 – Published: 2021-04-22 19:37 – Updated: 2024-09-16 18:14
VLAI
EPSS
VEX
Title
Junos OS: ACX500 Series, ACX4000 Series: Denial of Service due to FFEB crash while processing high rate of specific packets.
Summary
A vulnerability in Juniper Networks Junos OS ACX500 Series, ACX4000 Series, may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a Forwarding Engine Board (FFEB) crash. Continued receipt of these packets will sustain the Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on ACX500 Series, ACX4000 Series: 17.4 versions prior to 17.4R3-S2.
Severity
7.5 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11128 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
17.4 , < 17.4R3-S2
(custom)
|
Date Public
2021-04-14 00:00
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CVE-2021-0230 (GCVE-0-2021-0230)
Vulnerability from cvelistv5 – Published: 2021-04-22 19:36 – Updated: 2024-09-16 18:18
VLAI
EPSS
VEX
Title
Junos OS: SRX Series: Memory leak when querying Aggregated Ethernet (AE) interface statistics
Summary
On Juniper Networks SRX Series devices with link aggregation (lag) configured, executing any operation that fetches Aggregated Ethernet (AE) interface statistics, including but not limited to SNMP GET requests, causes a slow kernel memory leak. If all the available memory is consumed, the traffic will be impacted and a reboot might be required. The following log can be seen if this issue happens. /kernel: rt_pfe_veto: Memory over consumed. Op 1 err 12, rtsm_id 0:-1, msg type 72 /kernel: rt_pfe_veto: free kmem_map memory = (20770816) curproc = kmd An administrator can use the following CLI command to monitor the status of memory consumption (ifstat bucket): user@device > show system virtual-memory no-forwarding | match ifstat Type InUse MemUse HighUse Limit Requests Limit Limit Size(s) ifstat 2588977 162708K - 19633958 <<<< user@device > show system virtual-memory no-forwarding | match ifstat Type InUse MemUse HighUse Limit Requests Limit Limit Size(s) ifstat 3021629 189749K - 22914415 <<<< This issue affects Juniper Networks Junos OS on SRX Series: 17.1 versions 17.1R3 and above prior to 17.3R3-S11; 17.4 versions prior to 17.4R3-S5; 18.2 versions prior to 18.2R3-S7, 18.2R3-S8; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2-S2, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS prior to 17.1R3.
Severity
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
- Denial of Service (DoS)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11125 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
17.1R3 , < 17.1*
(custom)
Affected: 17.3 , < 17.3R3-S11 (custom) Affected: 17.4 , < 17.4R3-S5 (custom) Affected: 18.2 , < 18.2R3-S7, 18.2R3-S8 (custom) Affected: 18.3 , < 18.3R3-S4 (custom) Affected: 18.4 , < 18.4R2-S7, 18.4R3-S6 (custom) Affected: 19.1 , < 19.1R3-S4 (custom) Affected: 19.2 , < 19.2R1-S6 (custom) Affected: 19.3 , < 19.3R3-S1 (custom) Affected: 19.4 , < 19.4R3-S1 (custom) Affected: 20.1 , < 20.1R2, 20.1R3 (custom) Affected: 20.2 , < 20.2R2-S2, 20.2R3 (custom) Affected: 20.3 , < 20.3R1-S2, 20.3R2 (custom) |
|
| Juniper Networks | Junos OS |
Unaffected:
unspecified , < 17.1R3
(custom)
|
Date Public
2021-04-14 00:00
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"value": "On Juniper Networks SRX Series devices with link aggregation (lag) configured, executing any operation that fetches Aggregated Ethernet (AE) interface statistics, including but not limited to SNMP GET requests, causes a slow kernel memory leak. If all the available memory is consumed, the traffic will be impacted and a reboot might be required. The following log can be seen if this issue happens. /kernel: rt_pfe_veto: Memory over consumed. Op 1 err 12, rtsm_id 0:-1, msg type 72 /kernel: rt_pfe_veto: free kmem_map memory = (20770816) curproc = kmd An administrator can use the following CLI command to monitor the status of memory consumption (ifstat bucket): user@device \u003e show system virtual-memory no-forwarding | match ifstat Type InUse MemUse HighUse Limit Requests Limit Limit Size(s) ifstat 2588977 162708K - 19633958 \u003c\u003c\u003c\u003c user@device \u003e show system virtual-memory no-forwarding | match ifstat Type InUse MemUse HighUse Limit Requests Limit Limit Size(s) ifstat 3021629 189749K - 22914415 \u003c\u003c\u003c\u003c This issue affects Juniper Networks Junos OS on SRX Series: 17.1 versions 17.1R3 and above prior to 17.3R3-S11; 17.4 versions prior to 17.4R3-S5; 18.2 versions prior to 18.2R3-S7, 18.2R3-S8; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2-S2, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS prior to 17.1R3."
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CVE-2021-0229 (GCVE-0-2021-0229)
Vulnerability from cvelistv5 – Published: 2021-04-22 19:36 – Updated: 2024-09-16 18:08
VLAI
EPSS
VEX
Title
Junos OS: Receipt of specific packets could lead to Denial of Service in MQTT Server
Summary
An uncontrolled resource consumption vulnerability in Message Queue Telemetry Transport (MQTT) server of Juniper Networks Junos OS allows an attacker to cause MQTT server to crash and restart leading to a Denial of Service (DoS) by sending a stream of specific packets. A Juniper Extension Toolkit (JET) application designed with a listening port uses the Message Queue Telemetry Transport (MQTT) protocol to connect to a mosquitto broker that is running on Junos OS to subscribe for events. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 16.1R1 and later versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 16.1R1.
Severity
5.3 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
- Denial of Service (DoS)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11124 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
16.1R1 , < 16.1*
(custom)
Affected: 17.3 , < 17.3R3-S11 (custom) Affected: 17.4 , < 17.4R2-S13, 17.4R3-S4 (custom) Affected: 18.1 , < 18.1R3-S12 (custom) Affected: 18.2 , < 18.2R2-S8, 18.2R3-S7 (custom) Affected: 18.3 , < 18.3R3-S4 (custom) Affected: 18.4 , < 18.4R1-S8, 18.4R2-S7, 18.4R3-S7 (custom) Affected: 19.1 , < 19.1R3-S5 (custom) Affected: 19.2 , < 19.2R1-S6, 19.2R3-S2 (custom) Affected: 19.3 , < 19.3R3-S2 (custom) Affected: 19.4 , < 19.4R2-S4, 19.4R3-S2 (custom) Affected: 20.1 , < 20.1R2-S1, 20.1R3 (custom) Affected: 20.2 , < 20.2R2-S2, 20.2R3 (custom) Affected: 20.3 , < 20.3R1-S1, 20.3R2 (custom) |
Date Public
2021-04-14 00:00
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CVE-2021-0215 (GCVE-0-2021-0215)
Vulnerability from cvelistv5 – Published: 2021-01-15 17:35 – Updated: 2024-09-16 21:58
VLAI
EPSS
VEX
Title
Junos OS: EX Series, QFX Series, SRX Branch Series, MX Series: Memory leak in packet forwarding engine due to 802.1X authenticator port interface flaps
Summary
On Juniper Networks Junos EX series, QFX Series, MX Series and SRX branch series devices, a memory leak occurs every time the 802.1X authenticator port interface flaps which can lead to other processes, such as the pfex process, responsible for packet forwarding, to crash and restart. An administrator can use the following CLI command to monitor the status of memory consumption: user@device> show task memory detail Please refer to https://kb.juniper.net/KB31522 for details. This issue affects Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D54; 15.1X49 versions prior to 15.1X49-D240 ; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S8; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10 ; 18.2 versions prior to 18.2R2-S7, 18.2R3-S3; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3-S2; 19.1 versions prior to 19.1R1-S5, 19.1R2-S2, 19.1R3; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S3, 19.3R3; 19.4 versions prior to 19.4R1-S2, 19.4R2. This issue does not affect Juniper Networks Junos OS 12.3, 15.1.
Severity
6.5 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11105 | x_refsource_CONFIRM |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
Unaffected:
12.3
Unaffected: 15.1 |
|
| Juniper Networks | Junos OS |
Affected:
14.1X53 , < 14.1X53-D54
(custom)
|
|
| Juniper Networks | Junos OS |
Affected:
15.1X49 , < 15.1X49-D240
(custom)
|
|
| Juniper Networks | Junos OS |
Affected:
15.1X53 , < 15.1X53-D593
(custom)
|
|
| Juniper Networks | Junos OS |
Affected:
16.1 , < 16.1R7-S8
(custom)
Affected: 17.2 , < 17.2R3-S4 (custom) Affected: 17.3 , < 17.3R3-S8 (custom) Affected: 17.4 , < 17.4R2-S11, 17.4R3-S2 (custom) Affected: 18.1 , < 18.1R3-S10 (custom) Affected: 18.2 , < 18.2R2-S7, 18.2R3-S3 (custom) Affected: 18.3 , < 18.3R2-S4, 18.3R3-S2 (custom) Affected: 18.4 , < 18.4R1-S7, 18.4R2-S4, 18.4R3-S2 (custom) Affected: 19.1 , < 19.1R1-S5, 19.1R2-S2, 19.1R3 (custom) Affected: 19.2 , < 19.2R1-S5, 19.2R2 (custom) Affected: 19.3 , < 19.3R2-S3, 19.3R3 (custom) Affected: 19.4 , < 19.4R1-S2, 19.4R2 (custom) |
Date Public
2021-01-13 00:00
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CVE-2021-0202 (GCVE-0-2021-0202)
Vulnerability from cvelistv5 – Published: 2021-01-15 17:35 – Updated: 2024-09-17 00:31
VLAI
EPSS
VEX
Title
Junos OS: MX Series, EX9200 Series: Trio-based MPC memory leak when Integrated Routing and Bridging (IRB) interface is mapped to a VPLS instance or a Bridge-Domain
Summary
On Juniper Networks MX Series and EX9200 Series platforms with Trio-based MPC (Modular Port Concentrator) where Integrated Routing and Bridging (IRB) interface is configured and it is mapped to a VPLS instance or a Bridge-Domain, certain network events at Customer Edge (CE) device may cause memory leak in the MPC which can cause an out of memory and MPC restarts. When this issue occurs, there will be temporary traffic interruption until the MPC is restored. An administrator can use the following CLI command to monitor the status of memory usage level of the MPC: user@device> show system resource-monitor fpc FPC Resource Usage Summary Free Heap Mem Watermark : 20 % Free NH Mem Watermark : 20 % Free Filter Mem Watermark : 20 % * - Watermark reached Slot # % Heap Free RTT Average RTT 1 87 PFE # % ENCAP mem Free % NH mem Free % FW mem Free 0 NA 88 99 1 NA 89 99 When the issue is occurring, the value of “% NH mem Free” will go down until the MPC restarts. This issue affects MX Series and EX9200 Series with Trio-based PFEs (Packet Forwarding Engines). Please refer to https://kb.juniper.net/KB25385 for the list of Trio-based PFEs. This issue affects Juniper Networks Junos OS on MX Series, EX9200 Series: 17.3R3-S8; 17.4R3-S2; 18.2R3-S4, 18.2R3-S5; 18.3R3-S2, 18.3R3-S3; 18.4 versions starting from 18.4R3-S1 and later versions prior to 18.4R3-S6; 19.2 versions starting from 19.2R2 and later versions prior to 19.2R3-S1; 19.4 versions starting from 19.4R2 and later versions prior to 19.4R2-S3, 19.4R3; 20.2 versions starting from 20.2R1 and later versions prior to 20.2R1-S3, 20.2R2. This issue does not affect Juniper Networks Junos OS: 18.1, 19.1, 19.3, 20.1.
Severity
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11092 | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
17.3R3-S8
Affected: 17.4R3-S2 Unaffected: 18.1 Unaffected: 19.1 Unaffected: 19.3 Unaffected: 20.1 Affected: 18.2R3-S4 , < 18.2* (custom) Affected: 18.3R3-S2 , < 18.3* (custom) Affected: 18.4R3-S1 , < 18.4* (custom) Affected: 19.2R2 , < 19.2* (custom) Affected: 19.4R2 , < 19.4* (custom) Affected: 20.2R1 , < 20.2* (custom) |
Date Public
2021-01-13 00:00
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CVE-2020-36872 (GCVE-0-2020-36872)
Vulnerability from cvelistv5 – Published: 2025-11-26 22:13 – Updated: 2026-05-14 02:06
VLAI
EPSS
VEX
Title
BACnet Test Server 1.01 Malformed BVLC Length DoS
Summary
BACnet Test Server versions up to and including 1.01 contains a remote denial of service vulnerability in its BACnet/IP BVLC packet handling. The server fails to properly validate the BVLC Length field in incoming UDP BVLC frames on the default BACnet port (47808/udp). A remote unauthenticated attacker can send a malformed BVLC Length value to trigger an access violation and crash the application, resulting in a denial of service.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://www.zeroscience.mk/en/vulnerabilities/ZSL… | technical-descriptionexploit |
| https://www.exploit-db.com/exploits/48860 | exploit |
| https://packetstormsecurity.com/files/159504 | exploit |
| https://cxsecurity.com/issue/WLB-2020100045 | exploit |
| https://www.bac-test.com/ | product |
| https://www.vulncheck.com/advisories/bacnet-test-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BACnet Interoperability Test Services, Inc. | BACnet Test Server |
Affected:
0 , ≤ 1.01
(custom)
|
Date Public
2020-10-07 00:00
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CVE-2020-36620 (GCVE-0-2020-36620)
Vulnerability from cvelistv5 – Published: 2022-12-21 00:00 – Updated: 2025-04-15 12:56
VLAI
EPSS
VEX
Title
Brondahl EnumStringValues EnumExtensions.cs GetStringValuesWithPreferences_Uncache resource consumption
Summary
A vulnerability was found in Brondahl EnumStringValues up to 4.0.0. It has been declared as problematic. This vulnerability affects the function GetStringValuesWithPreferences_Uncache of the file EnumStringValues/EnumExtensions.cs. The manipulation leads to resource consumption. Upgrading to version 4.0.1 is able to address this issue. The name of the patch is c0fc7806beb24883cc2f9543ebc50c0820297307. It is recommended to upgrade the affected component. VDB-216466 is the identifier assigned to this vulnerability.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Resource Consumption
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.216466 | technical-descriptionvdb-entry |
| https://github.com/Brondahl/EnumStringValues/comm… | mitigationpatch |
| https://github.com/Brondahl/EnumStringValues/rele… | mitigation |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Brondahl | EnumStringValues |
Affected:
4.0
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CVE-2020-36320 (GCVE-0-2020-36320)
Vulnerability from cvelistv5 – Published: 2021-04-23 16:05 – Updated: 2024-09-16 16:58
VLAI
EPSS
VEX
Title
Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7
Summary
Unsafe validation RegEx in EmailValidator class in com.vaadin:vaadin-server versions 7.0.0 through 7.7.21 (Vaadin 7.0.0 through 7.7.21) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.
Severity
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://vaadin.com/security/cve-2020-36320 | x_refsource_MISC |
| https://github.com/vaadin/framework/issues/7757 | x_refsource_MISC |
| https://github.com/vaadin/framework/pull/12104 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Vaadin | Vaadin |
Affected:
7.0.0 , < *
(custom)
|
|
| Vaadin | vaadin-server |
Affected:
7.0.0 , < *
(custom)
|
Date Public
2020-10-08 00:00
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CVE-2020-35534 (GCVE-0-2020-35534)
Vulnerability from cvelistv5 – Published: 2022-09-01 17:54 – Updated: 2024-08-04 17:02
VLAI
EPSS
VEX
Summary
In LibRaw, there is a memory corruption vulnerability within the "crxFreeSubbandData()" function (libraw\src\decoders\crx.cpp) when processing cr3 files.
Severity
No CVSS data available.
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/LibRaw/LibRaw/issues/279 | x_refsource_MISC |
| https://github.com/LibRaw/LibRaw/commit/e41f331e9… | x_refsource_MISC |
Impacted products
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CVE-2020-35510 (GCVE-0-2020-35510)
Vulnerability from cvelistv5 – Published: 2021-06-02 13:22 – Updated: 2024-08-04 17:02
VLAI
EPSS
VEX
Summary
A flaw was found in jboss-remoting in versions before 5.0.20.SP1-redhat-00001. A malicious attacker could cause threads to hold up forever in the EJB server by writing a sequence of bytes corresponding to the expected messages of a successful EJB client request, but omitting the ACK messages, or just tamper with jboss-remoting code, deleting the lines that send the ACK message from the EJB client code resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1905796 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | jboss-remoting |
Affected:
jboss-remoting 5.0.20.SP1-redhat-00001
|
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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.