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CVE-2021-4241

20
FAUCET Score

CVE-2021-4241 is a medium-severity vulnerability affecting phpservermon, specifically within the setUserLoggedIn function of src/psm/Service/User.php. It stems from the use of a predictable algorithm in a random number generator, leading to potential compromise of user sessions. The vulnerability has a CVSS score of 5.3, indicating a network-based attack with low complexity and potential for unauthorized information disclosure. While a public exploit has been disclosed and a patch is available, there is currently no evidence of active exploitation, nor are there any known Metasploit or Nuclei modules, or significant community discussion surrounding it.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:phpservermonitor:php_server_monitor:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

2.6LOW

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.77%
Probability of exploitation in next 30 days
EPSS Percentile
51.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0077 is in the 32nd percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: phpservermon/phpservermonFixed in: 3.6.0
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-hc4j-7mqg-cxjjmedium

PHPServerMon PRNG has Insufficient Entropy

Nov 16, 2022

References

github.com / phpservermon/phpservermon/commit/bb10a5f3c68527c58073258cb12446782d223bc3
PatchThird Party Advisory
huntr.dev / bounties/1-phpservermon/phpservermon
ExploitPatchThird Party Advisory
vuldb.com
Third Party Advisory