CVE-2021-4240: A vulnerability, which was classified as problematic, was found in phpservermon

Routine

LOW 2.6MITIGATE

CVE-2021-4240 is a low-severity flaw (CVSS 2.6) affecting php server monitor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 identifi

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	2.6 (Low)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-331, CWE-330
Published	2022-11-15
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: phpservermonitor

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-11-15 23:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

phpservermonitor php server monitor MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy php-server-monitor || rpm -q php-server-monitor || php-server-monitor --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4240?

php server monitor: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-4240 being exploited?

CVE-2021-4240 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4240 affect?

CVE-2021-4240 affects php server monitor. Severity is low (CVSS 2.6). 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 num

How urgent is CVE-2021-4240?

Priority 29/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-4241 LOW 2.6 MITIGATE A vulnerability, which was classified as problematic, was found in phpservermon
CVE-2021-4097 MEDIUM 5.4 UPGRADE phpservermon is vulnerable to Improper Neutralization of CRLF Sequences

References

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