CVE-2021-4240

mediumpriority · track · 21OT risk · elevatedEPSS 0.009 · 59 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.89% (59th) EPSS

CVSS 5.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-26

A vulnerability, which was classified as problematic, was found in phpservermon. This affects the function generatePasswordResetToken of the file src/psm/Service/User.php. The manipulation leads to use of predictable algorithm in random number generator. The exploit has been disclosed to the public and may be used. The name of the patch is 3daa804d5f56c55b3ae13bfac368bb84ec632193. It is recommended to apply a patch to fix this issue. The identifier VDB-213717 was assigned to this vulnerability.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.6–5.3

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.12.6lowCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.12.6lowCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · cna@vuldb.comexploitability 1.2 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-330USprimaryCWE-1241USCWE-330USCWE-331USCWE-331US

affected products (3)

Products and version ranges known to be affected.

unspecified phpservermon≤ n/aenisa_euvdEU
phpservermonitor php server monitorall versionsnvdUScpe:2.3:a:phpservermonitor:php_server_monitor:*:*:*:*:*:*:*:*
Packagist phpservermon/phpservermon< 3.6.0osvUSpkg:composer/phpservermon/phpservermon

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-97w9-gcc7-vr8gInsufficient Entropy in PHPServerMon PRNG2022-11-16ghsa · osvUS
A vulnerability, which was classified as problematic, was found in phpservermon. This affects the function `generatePasswordResetToken` of the file `src/psm/Service/User.php`. The manipulation leads to use of predictable algorithm in random number generator. The exploit has been disclosed to the public and may be used. The name of the patch is 3daa804d5f56c55b3ae13bfac368bb84ec632193. It is recommended to apply a patch to fix this issue. The identifier VDB-213717 was assigned to this vulnerability.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2022-11-15modified 2026-06-17

related (573)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2019-5420US	critical9.8OT critical	89.3% (100th)	Exploit	2019-03-27
A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically generated development mode secret token. Thi…
CVE-2021-34646US	critical9.8OT high	50.9% (99th)	Exploit	2021-08-30
Versions up to, and including, 5.4.3, of the Booster for WooCommerce WordPress plugin are vulnerable to authentication bypass via the process_email_verification function due to a r…
CVE-2018-17888US	critical9.8OT high	29.6% (98th)	Exploit	2018-10-12
NUUO CMS all versions 3.1 and prior, The application uses a session identification mechanism that could allow attackers to obtain the active session ID, which could allow arbitrary…
CVE-2017-6026US	critical9.1OT high	31.8% (98th)	Exploit	2017-06-30
A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware…
CVE-2022-36536US	critical9.8OT high	4.85% (92nd)	Exploit	2022-09-16
An issue in the component post_applogin.php of Super Flexible Software GmbH & Co. KG Syncovery 9 for Linux v9.47x and below allows attackers to escalate privileges via creating cra…

+568 more

references (11)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan