Security readout for executives and security teams
Plain-English summary
phpservermon used a predictable random number algorithm in user login handling. A nearby authenticated attacker could potentially infer limited information tied to login state. The public record rates this as low severity, with high attack complexity and limited confidentiality impact.
Executive priority
Handle during normal maintenance unless phpservermon is exposed to untrusted adjacent networks or supports sensitive monitoring operations. The business risk is limited, but applying the patch is straightforward risk reduction.
Technical view
The issue affects setUserLoggedIn in src/psm/Service/User.php and is categorized as CWE-331. CVSS 3.1 is 2.6: adjacent attack vector, high complexity, low privileges required, no user interaction, and limited confidentiality impact only.
Likely exposure
Exposure is limited to organizations running phpservermon with affected code before the referenced patch. Sources do not identify specific vulnerable releases, so asset owners must map deployed code or package versions to upstream repository history.
Exploitation context
The vulnerability record says exploit details were publicly disclosed and may be used. It is not listed as KEV in the supplied bundle, and no supplied source confirms active exploitation.
Researcher notes
The supplied data lacks affected version ranges, environmental prerequisites beyond CVSS, and concrete exploit maturity details. Validate by code provenance against the patch commit rather than relying on product version names alone.
Mitigation direction
- Apply upstream patch commit bb10a5f3c68527c58073258cb12446782d223bc3 or a release containing it.
- If packaged by a third party, confirm the maintainer has backported the patch.
- Restrict phpservermon administrative and login access to trusted networks where feasible.
- Review project guidance for version-specific upgrade instructions.
Validation and detection
- Inventory phpservermon deployments and identify their exact source commit or package version.
- Confirm src/psm/Service/User.php includes the upstream patch changes.
- Check whether internet or adjacent-network users can reach phpservermon login surfaces.
- Review logs for suspicious authenticated access, while treating evidence as inconclusive without source-backed indicators.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-331: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-4241 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 2.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N1.21.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
2.6LowVector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://huntr.dev/bounties/1-phpservermon/phpservermon/CVE reference
- https://github.com/phpservermon/phpservermon/commit/bb10a5f3c68527c58073258cb12446782d223bc3CVE reference
- https://vuldb.com/?id.213744CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insufficient Entropy
Insufficient Entropy represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.