Common Weakness Enumeration

CWE-330

Weakness Discouraged

Use 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

Relationships and members
ChildOf: CWE-693 · View CWE-1000
CanPrecede: CWE-804 · View CWE-1000
Modes of introduction
Architecture and Design
Implementation

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
Submission: PLOVER · 2006-07-19 · CWE Draft 3
Modification: Eric Dalci · Cigital · 2008-07-01 · CWE 1.0

updated Time_of_Introduction

Modification: CWE Content Team · MITRE · 2008-09-08 · CWE 1.0

updated Background_Details, Relationships, Other_Notes, Relationship_Notes, Taxonomy_Mappings, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2008-11-24 · CWE 1.1

updated Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2009-01-12 · CWE 1.2

updated Description, Likelihood_of_Exploit, Other_Notes, Potential_Mitigations, Relationships

Modification: CWE Content Team · MITRE · 2009-03-10 · CWE 1.3

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2009-05-27 · CWE 1.4

updated Demonstrative_Examples, Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2009-12-28 · CWE 1.7

updated Applicable_Platforms, Common_Consequences, Description, Observed_Examples, Potential_Mitigations, Time_of_Introduction

Modification: CWE Content Team · MITRE · 2010-02-16 · CWE 1.8

updated References, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2010-04-05 · CWE 1.8.1

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2010-06-21 · CWE 1.9

updated Detection_Factors, Potential_Mitigations

Modification: CWE Content Team · MITRE · 2011-03-29 · CWE 1.12

updated Demonstrative_Examples

Modification: CWE Content Team · MITRE · 2011-06-01 · CWE 1.13

updated Common_Consequences, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2011-06-27 · CWE 2.0

updated Relationships

Modification: CWE Content Team · MITRE · 2011-09-13 · CWE 2.1

updated Potential_Mitigations, References, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated Demonstrative_Examples, Observed_Examples, References, Relationships

Modification: CWE Content Team · MITRE · 2014-02-18 · CWE 2.6

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2014-06-23 · CWE 2.7

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Detection_Factors

Modification: CWE Content Team · MITRE · 2015-12-07 · CWE 2.9

updated Relationships

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Functional_Areas, Likelihood_of_Exploit, Modes_of_Introduction, References, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2018-03-27 · CWE 3.1

updated References

Modification: CWE Content Team · MITRE · 2019-01-03 · CWE 3.2

updated Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2019-06-20 · CWE 3.3

updated Relationships

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Applicable_Platforms, Description, Relationships

Modification: CWE Content Team · MITRE · 2021-03-15 · CWE 4.4

updated Maintenance_Notes, Relationships

Modification: CWE Content Team · MITRE · 2021-07-20 · CWE 4.5

updated Demonstrative_Examples, Maintenance_Notes, Observed_Examples

Modification: CWE Content Team · MITRE · 2021-10-28 · CWE 4.6

updated Relationships

Modification: CWE Content Team · MITRE · 2022-10-13 · CWE 4.9

updated Observed_Examples, Relationships

Modification: CWE Content Team · MITRE · 2023-01-31 · CWE 4.10

updated Common_Consequences, Description

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated References, Relationships

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes, Relationships

Modification: CWE Content Team · MITRE · 2023-10-26 · CWE 4.13

updated Observed_Examples

Modification: CWE Content Team · MITRE · 2024-02-29 · CWE 4.14

updated Mapping_Notes

Modification: CWE Content Team · MITRE · 2025-09-09 · CWE 4.18

updated Description, Detection_Factors, Diagram, References

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated Relationships

Modification: CWE Content Team · MITRE · 2026-04-30 · CWE 4.20

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

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
VLAI
Title
Oray Pugongying X5 Pro Session ID session.lua session_get random values
Summary
A vulnerability was identified in Oray Pugongying X5 Pro up to 7.6.1. This impacts the function session_get of the file session.lua of the component Session ID Handler. The manipulation of the argument _user leads to insufficiently random values. The attack can be initiated remotely. The attack's complexity is rated as high. The exploitability is said to be difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 17:15 UTC
CWE
  • CWE-330 - Insufficiently Random Values
  • CWE-310 - Cryptographic Issues
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3801 records in the last 180 days details
References
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
Impacted products
Vendor Product Version
Oray Pugongying X5 Pro Affected: 7.6.0
Affected: 7.6.1
    cpe:2.3:a:oray:pugongying_x5_pro:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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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
VLAI
Title
Linksys RE6250 Web Management strcmp random values
Summary
A vulnerability has been found in Linksys RE6250 1.0.04.001. This affects the function strcmp of the component Web Management Interface. The manipulation of the argument session_id leads to insufficiently random values. The attack may be initiated remotely. The complexity of an attack is rather high. It is indicated that the exploitability is difficult. The exploit has been disclosed to the public and may be used.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 18:00 UTC
CWE
  • CWE-330 - Insufficiently Random Values
  • CWE-310 - Cryptographic Issues
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3801 records in the last 180 days details
References
Impacted products
Vendor Product Version
Linksys RE6250 Affected: 1.0.04.001
    cpe:2.3:o:linksys:re6250_firmware:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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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
VLAI
Summary
A flaw in Node.js `crypto` causes the internal entropy caches used by `crypto.randomUUID()`, `crypto.randomUUIDv7()`, and `crypto.randomInt()` to be saved into user-land startup snapshots (`--build-snapshot`) and single executable applications built with `useSnapshot`. If any of these functions, or an API that relies on them such as `URL.createObjectURL()`, is called while the snapshot is built, every process started from that snapshot returns the same values until the cache is refilled: up to 127 UUIDs and about 1,000 `randomInt()` values. Identifiers expected to be unique can collide across processes, and values issued by one process can be predicted by observing another. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 15:43 UTC
CWE
  • CWE-330 - Use of Insufficiently Random Values
Assigner
hackerone CNA under the mitre root
CNA scorecard D 59/100 over 212 records in the last 180 days details
Impacted products
Vendor Product Version
nodejs node Affected: 22.23.3 , ≤ 22.23.3 (semver)
Affected: 24.22.0 , ≤ 24.22.0 (semver)
Affected: 26.12.0 , ≤ 26.12.0 (semver)
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Show details on NVD website

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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
VLAI
Title
Joplin: Unauthenticated account takeover via an attacker-chosen application-authorisation identifier
Summary
Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.13, packages/server/src/models/ApplicationModel.ts accepts a caller-chosen application authorization identifier, applications/:id/confirm binds that identifier to a logged-in user through a generic consent page, and the public packages/server/src/routes/api/application_auth.ts endpoint passes it to ApplicationModel.createAppPassword without authenticating or binding the redeemer. An attacker can cause a victim to approve the attacker's identifier, redeem a durable application ID and password, and exchange the credential for a victim session with full read and write access to synchronized data. This vulnerability is fixed in 3.7.13.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 17:39 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-330 - Use of Insufficiently Random Values
  • CWE-863 - Incorrect Authorization
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
Impacted products
Vendor Product Version
laurent22 joplin Affected: < 3.7.13
Create a notification for this product.
Show details on NVD website

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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
VLAI
Title
Predictable Media Stream Pre-Shared Key Vulnerability in TP-Link Tapo C325WB
Summary
TP-Link Tapo C325WB V2 generates the pre-shared key used by its local media streaming service with a time-seeded pseudo-random number generator, making the key predictable and recoverable. An unauthenticated attacker on the adjacent network can recover the key and authenticate to the media streaming service without valid user credentials.  Successful exploitation may allow an unauthenticated adjacent-network attacker to access and take over live video and audio streams, compromising the confidentiality and integrity of camera media.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 15:20 UTC
CWE
  • CWE-330 - Use of Insufficiently Random Values
Assigner
TPLink CNA under the mitre root
CNA scorecard B 87/100 over 110 records in the last 180 days details
Impacted products
Vendor Product Version
TP-Link Systems Inc. Tapo C325WB v2 Affected: 0 , < V2_1.3.3 Build 260914 (custom)
Create a notification for this product.
Show details on NVD website

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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
VLAI
Title
NetX Secure DTLS server issues predictable HelloVerifyRequest cookies, so a spoofed client can pass the return-routability check
Summary
In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, the NetX Secure DTLS server fills HelloVerifyRequest cookies from NX_RAND(), by default the C library rand(), with no key and no binding to the client. An attacker who can predict the generator's output can pass the cookie exchange from a spoofed address and make the server send its handshake flight to a victim, using it as a traffic reflector.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 18:39 UTC
CWE
  • CWE-338 - Use of cryptographically weak Pseudo-Random number generator (PRNG)
Assigner
eclipse CNA under the mitre root
CNA scorecard C 66/100 over 204 records in the last 180 days details
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse ThreadX NetX Duo Affected: 6.0 , ≤ 6.5.2.202603a (custom)
Unaffected: 6.5.2.202603b (custom)
Create a notification for this product.
Show details on NVD website

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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
VLAI
Title
Isotope eCommerce through 2.9.10 Weak Order Identifier Generation
Summary
Isotope eCommerce through 2.9.10 derives order identifiers from uniqid() instead of a cryptographically secure source, allowing unauthenticated attackers to guess identifiers. Guest orders lack ownership verification, enabling attackers to access order details including billing address, customer information, and purchased files by supplying a guessed uid parameter.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 15:19 UTC
CWE
  • CWE-330 - Use of Insufficiently Random Values
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7605 records in the last 180 days details
Impacted products
Vendor Product Version
isotope isotope-core Affected: 0 , ≤ 2.9.10 (semver)
Create a notification for this product.
Date Public
2026-09-23 00:00
Credits
Show details on NVD website

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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
VLAI
Title
FileGator: Missing authorization in GET /batchdownload allows cross-user retrieval of another user's archive
Summary
FileGator is a multi-user file manager. Prior to 7.15.0, GET /batchdownload in backend/Controllers/DownloadController.php uses batchDownloadStart() to stream a shared temporary archive selected by the request-supplied uniqid without checking that the current session created it. In deployments with distinct per-user home directories, a valid user with read, download, and batchdownload permissions who obtains another user's active archive id can cross that boundary and retrieve the victim's batch archive. The archive lifetime and id-acquisition requirement limit exploitation, but a successful replay also deletes the victim's pending archive. This issue is fixed in version 7.15.0.
CWE
  • CWE-330 - Use of Insufficiently Random Values
  • CWE-862 - Missing Authorization
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7895 records in the last 180 days details
Impacted products
Vendor Product Version
filegator filegator Affected: < 7.15.0
Create a notification for this product.
Show details on NVD website

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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
VLAI
Title
Unauthenticated recovery of the Math.random() state behind OAuth tokens, authorization codes, client secrets and organization API keys
Summary
Postiz generates security-sensitive credentials using `Math.random()` instead of a cryptographically secure source. The same helper is used for OAuth access tokens, authorization codes, client secrets, organization API keys, and PKCE verifiers, meaning these credentials depend entirely on V8’s deterministic xorshift128+ PRNG state. An unauthenticated OAuth dynamic client registration endpoint exposes freshly generated client credentials, giving attackers enough consecutive PRNG output to reconstruct that internal state. Once recovered, they can deterministically derive past and future values produced by the same generator, potentially compromising credentials belonging to other users and organizations.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 18:10 UTC
Assigner
postiz CNA under the mitre root
CNA scorecard – unranked: 8 records in the last 180 days, 10 needed details
Impacted products
Vendor Product Version
GitroomHQ postiz-app Affected: 0 , < 2.4.0 (semver)
Create a notification for this product.
Date Public
2026-09-22 14:17
Show details on NVD website

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          "lang": "en",
          "value": "Blocking or requiring authentication on the OAuth dynamic client registration endpoint at a reverse proxy, gateway or WAF removes the anonymous bulk-sampling surface, which is the part of this issue reachable without an account. It does not make the generated values unpredictable, and it does not close the surfaces available to an authenticated user, so it narrows exposure rather than resolving it. Deployments that do not use OAuth or MCP client integrations can apply this with no loss of function."
        },
        {
          "lang": "en",
          "value": "Rotating organization API keys or OAuth client secrets while still running an affected version does not help, and should not be relied on as a mitigation. The replacement value is produced by the same generator and is predictable on the same terms as the value it replaces. Rotation is only meaningful once the generator itself no longer draws from Math.random()."
        },
        {
          "lang": "en",
          "value": "Where the deployment allows it, restricting the public API to known client networks limits who can present a predicted credential. This is a containment measure for the consequence rather than a fix for the predictability."
        }
      ]
    }
  },
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    "assignerShortName": "postiz",
    "cveId": "CVE-2026-94456",
    "datePublished": "2026-09-22T16:11:33.674Z",
    "dateReserved": "2026-09-21T17:11:13.201Z",
    "dateUpdated": "2026-09-22T18:11:17.502Z",
    "state": "PUBLISHED"
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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
VLAI
Summary
OpenEye Apex Network Video Recorder (NVR) firmware 3.2.9.376 uses an administrator password-reset unlock-code design that lacks a per-device secret or other server-side cryptographic material. An attacker with physical-console access and access to the privileged password-reset workflow can forge a valid unlock code offline and use it to reset the administrator password. The underlying design has been present since at least firmware 2.2.3.4. Upgrade to version 3.5.4.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 13:40 UTC
CWE
  • CWE-330 - Use of Insufficiently Random Values
Assigner
Securifera CNA under the mitre root
CNA scorecard – unranked: 7 records in the last 180 days, 10 needed details
Impacted products
Show details on NVD website

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Mitigation
Architecture and Design
  • 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
Implementation

Consider a PRNG that re-seeds itself as needed from high quality pseudo-random output sources, such as hardware devices.

Mitigation MIT-2
Architecture and Design Requirements

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.