Common Weakness Enumeration
CWE-331
AllowedInsufficient Entropy
Abstraction: Base · Status: Draft
The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.
221 vulnerabilities reference this CWE, most recent first.
GHSA-CV48-2FRC-94W5
Vulnerability from github – Published: 2022-05-24 19:08 – Updated: 2022-05-24 19:08
VLAI
Details
A CWE-331: Insufficient Entropy vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) that could allow an attacker to gain unauthorized access to the charging station web server
{
"affected": [],
"aliases": [
"CVE-2021-22727"
],
"database_specific": {
"cwe_ids": [
"CWE-331"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-07-21T15:15:00Z",
"severity": "CRITICAL"
},
"details": "A CWE-331: Insufficient Entropy vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) that could allow an attacker to gain unauthorized access to the charging station web server",
"id": "GHSA-cv48-2frc-94w5",
"modified": "2022-05-24T19:08:48Z",
"published": "2022-05-24T19:08:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22727"
},
{
"type": "WEB",
"url": "http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-CVMX-9H9Q-8HMW
Vulnerability from github – Published: 2022-05-13 01:36 – Updated: 2022-05-13 01:36
VLAI
Details
It was discovered that libXdmcp before 1.1.2 including used weak entropy to generate session keys. On a multi-user system using xdmcp, a local attacker could potentially use information available from the process list to brute force the key, allowing them to hijack other users' sessions.
Severity
5.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2017-2625"
],
"database_specific": {
"cwe_ids": [
"CWE-331"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-07-27T18:29:00Z",
"severity": "MODERATE"
},
"details": "It was discovered that libXdmcp before 1.1.2 including used weak entropy to generate session keys. On a multi-user system using xdmcp, a local attacker could potentially use information available from the process list to brute force the key, allowing them to hijack other users\u0027 sessions.",
"id": "GHSA-cvmx-9h9q-8hmw",
"modified": "2022-05-13T01:36:52Z",
"published": "2022-05-13T01:36:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-2625"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2017:1865"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2017-2625"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1424987"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2625"
},
{
"type": "WEB",
"url": "https://cgit.freedesktop.org/xorg/lib/libXdmcp/commit/?id=0554324ec6bbc2071f5d1f8ad211a1643e29eb1f"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2019/11/msg00024.html"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/201704-03"
},
{
"type": "WEB",
"url": "https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/96480"
},
{
"type": "WEB",
"url": "http://www.securitytracker.com/id/1037919"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-FGHC-HPWQ-XM37
Vulnerability from github – Published: 2026-07-07 09:37 – Updated: 2026-07-07 15:32
VLAI
Details
EEPROM firmware on Raspberry Pi 5 and Compute Module 5 devices produced non-random KASLR and RNG seed values. This resulted in consistent kernel addresses across boots and devices, potentially making it easier to exploit other vulnerabilities. Additionally, the low-quality RNG seed may affect the quality of random numbers or delay booting while sufficient entropy is accumulated from other sources.
Severity
4.0 (Medium)
{
"affected": [],
"aliases": [
"CVE-2026-13199"
],
"database_specific": {
"cwe_ids": [
"CWE-331"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-07T09:16:29Z",
"severity": "MODERATE"
},
"details": "EEPROM firmware on Raspberry Pi 5 and Compute Module 5 devices produced non-random KASLR and RNG seed values. This resulted in consistent kernel addresses across boots and devices, potentially making it easier to exploit other vulnerabilities. Additionally, the low-quality RNG seed may affect the quality of random numbers or delay booting while sufficient entropy is accumulated from other sources.",
"id": "GHSA-fghc-hpwq-xm37",
"modified": "2026-07-07T15:32:56Z",
"published": "2026-07-07T09:37:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13199"
},
{
"type": "WEB",
"url": "https://github.com/raspberrypi/rpi-eeprom/pull/841"
},
{
"type": "WEB",
"url": "https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-13199"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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-FMG6-246M-9G2V
Vulnerability from github – Published: 2026-04-03 03:41 – Updated: 2026-04-03 03:41
VLAI
Summary
Auth0 laravel-auth0 SDK has Insufficient Entropy in Cookie Encryption
Details
Impact
In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.
Am I Affected?
You are affected if you meet the following preconditions:
- Applications using laravel-auth0 SDK, versions between 7.0.0 and 7.20.0
- Laravel-auth0 SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.
Resolution
Upgrade Auth0/laravel-auth0 to version 7.21.0 or greater.
Severity
8.2 (High)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 7.20.0"
},
"package": {
"ecosystem": "Packagist",
"name": "auth0/login"
},
"ranges": [
{
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.21.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-331"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-03T03:41:04Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Impact\nIn applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.\n\n### Am I Affected?\nYou are affected if you meet the following preconditions:\n\n- Applications using laravel-auth0 SDK, versions between 7.0.0 and 7.20.0\n- Laravel-auth0 SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.\n\n\n### Resolution\nUpgrade Auth0/laravel-auth0 to version 7.21.0 or greater.",
"id": "GHSA-fmg6-246m-9g2v",
"modified": "2026-04-03T03:41:04Z",
"published": "2026-04-03T03:41:04Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/auth0/laravel-auth0/security/advisories/GHSA-fmg6-246m-9g2v"
},
{
"type": "PACKAGE",
"url": "https://github.com/auth0/laravel-auth0"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Auth0 laravel-auth0 SDK has Insufficient Entropy in Cookie Encryption"
}
GHSA-FPQV-CR66-H6PC
Vulnerability from github – Published: 2026-04-16 18:31 – Updated: 2026-07-14 15:31
VLAI
Details
libexpat before 2.7.6 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
Severity
{
"affected": [],
"aliases": [
"CVE-2026-41080"
],
"database_specific": {
"cwe_ids": [
"CWE-331"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-16T17:16:54Z",
"severity": "LOW"
},
"details": "libexpat before 2.7.6 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.",
"id": "GHSA-fpqv-cr66-h6pc",
"modified": "2026-07-14T15:31:51Z",
"published": "2026-04-16T18:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41080"
},
{
"type": "WEB",
"url": "https://github.com/libexpat/libexpat/issues/47"
},
{
"type": "WEB",
"url": "https://github.com/libexpat/libexpat/pull/1183"
},
{
"type": "WEB",
"url": "https://blog.hartwork.org/posts/expat-2-8-0-released"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
},
{
"type": "WEB",
"url": "https://www.openwall.com/lists/oss-security/2026/04/26/1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2026/04/26/1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
}
]
}
GHSA-G3HM-J3WC-JCG9
Vulnerability from github – Published: 2025-03-28 03:30 – Updated: 2025-09-05 15:31
VLAI
Details
Data::Entropy for Perl 0.007 and earlier use the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.
Severity
7.7 (High)
{
"affected": [],
"aliases": [
"CVE-2025-1860"
],
"database_specific": {
"cwe_ids": [
"CWE-331",
"CWE-338"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-03-28T01:15:16Z",
"severity": "HIGH"
},
"details": "Data::Entropy for Perl 0.007 and earlier use the rand() function as the default source of entropy, which is not\u00a0cryptographically secure,\u00a0for cryptographic functions.",
"id": "GHSA-g3hm-j3wc-jcg9",
"modified": "2025-09-05T15:31:06Z",
"published": "2025-03-28T03:30:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-1860"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00026.html"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/ZEFRAM/Data-Entropy-0.007/source/lib/Data/Entropy.pm#L80"
},
{
"type": "WEB",
"url": "https://perldoc.perl.org/functions/rand"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-GFJ4-2P4P-M25J
Vulnerability from github – Published: 2025-04-07 15:31 – Updated: 2025-04-07 21:32
VLAI
Details
Web::API 2.8 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.
Specifically Web::API uses the Data::Random library which specifically states that it is "Useful mostly for test programs". Data::Random uses the rand() function.
Severity
5.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2024-57868"
],
"database_specific": {
"cwe_ids": [
"CWE-331",
"CWE-338"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-05T16:15:33Z",
"severity": "MODERATE"
},
"details": "Web::API 2.8 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.\n\nSpecifically Web::API uses the Data::Random library which specifically states that it is \"Useful mostly for test programs\". Data::Random uses the rand() function.",
"id": "GHSA-gfj4-2p4p-m25j",
"modified": "2025-04-07T21:32:07Z",
"published": "2025-04-07T15:31:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-57868"
},
{
"type": "WEB",
"url": "https://metacpan.org/dist/Web-API/source/lib/Web/API.pm#L20"
},
{
"type": "WEB",
"url": "https://metacpan.org/dist/Web-API/source/lib/Web/API.pm#L348"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/BAREFOOT/Data-Random-0.13/source/lib/Data/Random.pm#L537"
},
{
"type": "WEB",
"url": "https://perldoc.perl.org/functions/rand"
},
{
"type": "WEB",
"url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L",
"type": "CVSS_V3"
}
]
}
GHSA-GHC5-95C2-VWCV
Vulnerability from github – Published: 2026-04-03 03:44 – Updated: 2026-04-03 03:44
VLAI
Summary
Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption
Details
Impact
In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.
Am I Affected?
Consumers are affected if their application meets the following preconditions: - It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0 - Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.
Resolution
Upgrade Auth0/symfony-auth0 to version 5.8.0 or greater.
Severity
8.2 (High)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 5.7.0"
},
"package": {
"ecosystem": "Packagist",
"name": "auth0/symfony"
},
"ranges": [
{
"events": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.8.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-331"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-03T03:44:13Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Impact\nIn applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.\n\n### Am I Affected?\nConsumers are affected if their application meets the following preconditions:\n- It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0\n- Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.\n\n### Resolution\nUpgrade Auth0/symfony-auth0 to version 5.8.0 or greater.",
"id": "GHSA-ghc5-95c2-vwcv",
"modified": "2026-04-03T03:44:13Z",
"published": "2026-04-03T03:44:13Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/auth0/symfony/security/advisories/GHSA-ghc5-95c2-vwcv"
},
{
"type": "PACKAGE",
"url": "https://github.com/auth0/symfony"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption"
}
GHSA-GQ9M-QVPX-68HC
Vulnerability from github – Published: 2019-08-21 16:15 – Updated: 2024-11-19 18:05
VLAI
Summary
Pallets Werkzeug Insufficient Entropy
Details
Pallets Werkzeug before 0.15.3, when used with Docker, has insufficient debugger PIN randomness because Docker containers share the same machine id.
Severity
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "werkzeug"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.15.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2019-14806"
],
"database_specific": {
"cwe_ids": [
"CWE-331"
],
"github_reviewed": true,
"github_reviewed_at": "2019-08-21T16:01:59Z",
"nvd_published_at": "2019-08-09T15:15:00Z",
"severity": "HIGH"
},
"details": "Pallets Werkzeug before 0.15.3, when used with Docker, has insufficient debugger PIN randomness because Docker containers share the same machine id.",
"id": "GHSA-gq9m-qvpx-68hc",
"modified": "2024-11-19T18:05:58Z",
"published": "2019-08-21T16:15:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-14806"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/00bc43b1672e662e5e3b8cecd79e67fc968fa246"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/blob/7fef41b120327d3912fbe12fb64f1951496fcf3e/src/werkzeug/debug/__init__.py#L168"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2019-140.yaml"
},
{
"type": "WEB",
"url": "https://palletsprojects.com/blog/werkzeug-0-15-3-released"
},
{
"type": "WEB",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00034.html"
},
{
"type": "WEB",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00047.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Pallets Werkzeug Insufficient Entropy"
}
GHSA-H236-32WJ-MG7X
Vulnerability from github – Published: 2025-04-05 21:30 – Updated: 2025-04-14 18:31
VLAI
Details
Net::Xero 0.044 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.
Specifically Net::Xero uses the Data::Random library which specifically states that it is "Useful mostly for test programs". Data::Random uses the rand() function.
Severity
6.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2024-56370"
],
"database_specific": {
"cwe_ids": [
"CWE-331",
"CWE-338"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-05T19:15:38Z",
"severity": "MODERATE"
},
"details": "Net::Xero 0.044 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.\n\nSpecifically Net::Xero uses the Data::Random library which specifically states that it is \"Useful mostly for test programs\". Data::Random uses the rand() function.",
"id": "GHSA-h236-32wj-mg7x",
"modified": "2025-04-14T18:31:48Z",
"published": "2025-04-05T21:30:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56370"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/BAREFOOT/Data-Random-0.13/source/lib/Data/Random.pm#L537"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/ELLIOTT/Net-Xero-0.44/source/lib/Net/Xero.pm#L58"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/ELLIOTT/Net-Xero-0.44/source/lib/Net/Xero.pm#L9"
},
{
"type": "WEB",
"url": "https://perldoc.perl.org/functions/rand"
},
{
"type": "WEB",
"url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
}
]
}
Mitigation
Implementation
Determine the necessary entropy to adequately provide for randomness and predictability. This can be achieved by increasing the number of bits of objects such as keys and seeds.
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.