CWE-330
Weakness DiscouragedUse of Insufficiently Random Values
Abstraction: Class · Status: Stable
The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.
Dimensions
- Behavior-Type: Use
- Resource-Type: Values
- Resource-Property: Insufficiently Random
Mapping guidance
This CWE entry is a level-1 Class (i.e., a child of a Pillar). It might have lower-level children that would be more appropriate
Examine children of this entry to see if there is a better fit
Modes of introduction
REALIZATION: This weakness is caused during implementation of an architectural security tactic.
Detection methods
Black Box
Use monitoring tools that examine the software's process as it interacts with the operating system and the network. This technique is useful in cases when source code is unavailable, if the software was not developed by you, or if you want to verify that the build phase did not introduce any new weaknesses. Examples include debuggers that directly attach to the running process; system-call tracing utilities such as truss (Solaris) and strace (Linux); system activity monitors such as FileMon, RegMon, Process Monitor, and other Sysinternals utilities (Windows); and sniffers and protocol analyzers that monitor network traffic.
Attach the monitor to the process and look for library functions that indicate when randomness is being used. Run the process multiple times to see if the seed changes. Look for accesses of devices or equivalent resources that are commonly used for strong (or weak) randomness, such as /dev/urandom on Linux. Look for library or system calls that access predictable information such as process IDs and system time.
Automated Static Analysis - Binary or Bytecode
According to SOAR [REF-1479], the following detection techniques may be useful:
Cost effective for partial coverage:
Bytecode Weakness Analysis - including disassembler + source code weakness analysis
Binary Weakness Analysis - including disassembler + source code weakness analysis
Effectiveness: SOAR Partial
Manual Static Analysis - Binary or Bytecode
According to SOAR [REF-1479], the following detection techniques may be useful:
Cost effective for partial coverage:
Binary / Bytecode disassembler - then use manual analysis for vulnerabilities & anomalies
Effectiveness: SOAR Partial
Dynamic Analysis with Manual Results Interpretation
According to SOAR [REF-1479], the following detection techniques may be useful:
Cost effective for partial coverage:
Man-in-the-middle attack tool
Effectiveness: SOAR Partial
Manual Static Analysis - Source Code
According to SOAR [REF-1479], the following detection techniques may be useful:
Highly cost effective:
Focused Manual Spotcheck - Focused manual analysis of source
Manual Source Code Review (not inspections)
Effectiveness: High
Automated Static Analysis - Source Code
According to SOAR [REF-1479], the following detection techniques may be useful:
Cost effective for partial coverage:
Source code Weakness Analyzer
Context-configured Source Code Weakness Analyzer
Effectiveness: SOAR Partial
Architecture or Design Review
According to SOAR [REF-1479], the following detection techniques may be useful:
Highly cost effective:
Inspection (IEEE 1028 standard) (can apply to requirements, design, source code, etc.)
Effectiveness: High
Notes
Relationship
This can be primary to many other weaknesses such as cryptographic errors, authentication errors, symlink following, information leaks, and others.
Maintenance
As of CWE 4.3, CWE-330 and its descendants are being investigated by the CWE crypto team to identify gaps related to randomness and unpredictability, as well as the relationships between randomness and cryptographic primitives. This "subtree analysis" might result in the addition or deprecation of existing entries; the reorganization of relationships in some views, e.g. the research view (CWE-1000); more consistent use of terminology; and/or significant modifications to related entries.
Maintenance
As of CWE 4.5, terminology related to randomness, entropy, and predictability can vary widely. Within the developer and other communities, "randomness" is used heavily. However, within cryptography, "entropy" is distinct, typically implied as a measurement. There are no commonly-used definitions, even within standards documents and cryptography papers. Future versions of CWE will attempt to define these terms and, if necessary, distinguish between them in ways that are appropriate for different communities but do not reduce the usability of CWE for mapping, understanding, or other scenarios.
Content history
updated Time_of_Introduction
updated Background_Details, Relationships, Other_Notes, Relationship_Notes, Taxonomy_Mappings, Weakness_Ordinalities
updated Relationships, Taxonomy_Mappings
updated Description, Likelihood_of_Exploit, Other_Notes, Potential_Mitigations, Relationships
updated Potential_Mitigations
updated Demonstrative_Examples, Related_Attack_Patterns
updated Applicable_Platforms, Common_Consequences, Description, Observed_Examples, Potential_Mitigations, Time_of_Introduction
updated References, Relationships, Taxonomy_Mappings
updated Related_Attack_Patterns
updated Detection_Factors, Potential_Mitigations
updated Demonstrative_Examples
updated Common_Consequences, Relationships, Taxonomy_Mappings
updated Relationships
updated Potential_Mitigations, References, Relationships, Taxonomy_Mappings
updated Demonstrative_Examples, Observed_Examples, References, Relationships
updated Related_Attack_Patterns
updated Related_Attack_Patterns
updated Detection_Factors
updated Relationships
updated Functional_Areas, Likelihood_of_Exploit, Modes_of_Introduction, References, Relationships, Taxonomy_Mappings
updated References
updated Relationships, Taxonomy_Mappings
updated Relationships
updated Applicable_Platforms, Description, Relationships
updated Maintenance_Notes, Relationships
updated Demonstrative_Examples, Maintenance_Notes, Observed_Examples
updated Relationships
updated Observed_Examples, Relationships
updated Common_Consequences, Description
updated References, Relationships
updated Mapping_Notes, Relationships
updated Observed_Examples
updated Mapping_Notes
updated Description, Detection_Factors, Diagram, References
updated Relationships
updated Potential_Mitigations
updated Applicable_Platforms, Demonstrative_Examples, Dimensions, Observed_Examples, References, Relationships, Taxonomy_Mappings
517 vulnerabilities reference this CWE, most recent first.
CVE-2026-120223 (GCVE-0-2026-120223)
Vulnerability from cvelistv5 – Published: 2026-11-01 10:00 – Updated: 2026-11-02 17:43| URL | Tags |
|---|---|
| https://vuldb.com/vuln/429582 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/429582/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-120223 | third-party-advisory |
| https://vuldb.com/submit/1007539 | third-party-advisory |
| https://app.notion.com/p/Oray-Pgyer-X5-Pro-Router… | exploit |
| Vendor | Product | Version | |
|---|---|---|---|
| Oray | Pugongying X5 Pro |
Affected:
7.6.0
Affected: 7.6.1 cpe:2.3:a:oray:pugongying_x5_pro:*:*:*:*:*:*:*:* |
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CVE-2026-114576 (GCVE-0-2026-114576)
Vulnerability from cvelistv5 – Published: 2026-10-22 01:30 – Updated: 2026-10-23 21:16| URL | Tags |
|---|---|
| https://vuldb.com/vuln/424944 | vdb-entrytechnical-description |
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| https://vuldb.com/submit/1021306 | third-party-advisory |
| https://github.com/b1uerry/cves/blob/main/Linksys… | exploit |
| https://www.linksys.com/ | product |
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CVE-2026-106074 (GCVE-0-2026-106074)
Vulnerability from cvelistv5 – Published: 2026-10-23 16:15 – Updated: 2026-11-02 15:48- CWE-330 - Use of Insufficiently Random Values
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CVE-2026-105786 (GCVE-0-2026-105786)
Vulnerability from cvelistv5 – Published: 2026-10-05 23:18 – Updated: 2026-10-06 17:39| URL | Tags |
|---|---|
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CVE-2026-105674 (GCVE-0-2026-105674)
Vulnerability from cvelistv5 – Published: 2026-10-08 22:21 – Updated: 2026-10-15 15:21- CWE-330 - Use of Insufficiently Random Values
| URL | Tags |
|---|---|
| https://www.tp-link.com/us/support/download/tapo-… | patch |
| https://www.tp-link.com/en/support/download/tapo-… | patch |
| https://www.tp-link.com/us/support/faq/5333/ | vendor-advisory |
| Vendor | Product | Version | |
|---|---|---|---|
| TP-Link Systems Inc. | Tapo C325WB v2 |
Affected:
0 , < V2_1.3.3 Build 260914
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CVE-2026-102719 (GCVE-0-2026-102719)
Vulnerability from cvelistv5 – Published: 2026-09-29 17:45 – Updated: 2026-11-04 09:36- CWE-338 - Use of cryptographically weak Pseudo-Random number generator (PRNG)
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse ThreadX NetX Duo |
Affected:
6.0 , ≤ 6.5.2.202603a
(custom)
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CVE-2026-96599 (GCVE-0-2026-96599)
Vulnerability from cvelistv5 – Published: 2026-09-23 14:52 – Updated: 2026-09-24 14:23- CWE-330 - Use of Insufficiently Random Values
| URL | Tags |
|---|---|
| https://github.com/isotope/core/issues/2585 | issue-tracking |
| https://github.com/isotope/core | product |
| https://github.com/isotope/core/blob/028d47cbe69c… | technical-description |
| https://github.com/isotope/core/blob/028d47cbe69c… | technical-description |
| https://www.vulncheck.com/advisories/isotope-ecom… | third-party-advisory |
| Vendor | Product | Version | |
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| isotope | isotope-core |
Affected:
0 , ≤ 2.9.10
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CVE-2026-94618 (GCVE-0-2026-94618)
Vulnerability from cvelistv5 – Published: 2026-11-06 21:30 – Updated: 2026-11-06 21:30| URL | Tags |
|---|---|
| https://github.com/filegator/filegator/security/a… | x_refsource_CONFIRM |
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CVE-2026-94456 (GCVE-0-2026-94456)
Vulnerability from cvelistv5 – Published: 2026-09-22 16:11 – Updated: 2026-09-22 18:11| URL | Tags |
|---|---|
| https://github.com/gitroomhq/postiz-app | product |
| https://github.com/gitroomhq/postiz-app/releases/… | release-notes |
| https://github.com/gitroomhq/postiz-app/commit/92… | patch |
| https://gadvisory.org/advisories/PSA-2026-TD98KY | vendor-advisory |
| Vendor | Product | Version | |
|---|---|---|---|
| GitroomHQ | postiz-app |
Affected:
0 , < 2.4.0
(semver)
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"lang": "en",
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CVE-2026-92930 (GCVE-0-2026-92930)
Vulnerability from cvelistv5 – Published: 2026-09-22 23:10 – Updated: 2026-09-23 13:42- CWE-330 - Use of Insufficiently Random Values
| Vendor | Product | Version | |
|---|---|---|---|
| OpenEye | Apex Network Video Recorder (NVR) |
Affected:
3.2.9.376
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Mitigation
- Use a well-vetted algorithm that is currently considered to be strong by experts in the field, and select well-tested implementations with adequate length seeds.
- In general, if a pseudo-random number generator is not advertised as being cryptographically secure, then it is probably a statistical PRNG and should not be used in security-sensitive contexts.
- Pseudo-random number generators can produce predictable numbers if the generator is known and the seed can be guessed. A 256-bit seed is a good starting point for producing a "random enough" number.
Mitigation
Consider a PRNG that re-seeds itself as needed from high quality pseudo-random output sources, such as hardware devices.
Mitigation MIT-2
Strategy: Libraries or Frameworks
Use products or modules that conform to FIPS 140-2 [REF-267] to avoid obvious entropy problems. Consult FIPS 140-2 Annex C ("Approved Random Number Generators").
CAPEC-112: Brute Force
In this attack, some asset (information, functionality, identity, etc.) is protected by a finite secret value. The attacker attempts to gain access to this asset by using trial-and-error to exhaustively explore all the possible secret values in the hope of finding the secret (or a value that is functionally equivalent) that will unlock the asset.
CAPEC-485: Signature Spoofing by Key Recreation
An attacker obtains an authoritative or reputable signer's private signature key by exploiting a cryptographic weakness in the signature algorithm or pseudorandom number generation and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.
CAPEC-59: Session Credential Falsification through Prediction
This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.