Security readout for executives and security teams
Plain-English summary
CVE-2021-3172 affects Php-Fusion v9.03.90 and was fixed in v9.10.00. An authenticated user could abuse the polling feature to create denial-of-service impact. The business risk is service disruption from a low-privileged account, not data theft based on the supplied sources.
Executive priority
Treat this as high priority for internet-facing or community-facing PHPFusion sites. The main concern is disruption from authenticated users. Patch quickly, especially where many users can log in or self-register.
Technical view
The CVE describes a network-accessible, low-complexity issue in Php-Fusion’s polling feature requiring authenticated privileges and no user interaction. CVSS 3.1 is 8.1, with high integrity and availability impact and no confidentiality impact. Source metadata lists CWE-732, but affected CPE data is incomplete.
Likely exposure
Exposure is most likely on Php-Fusion v9.03.90 installations where untrusted or broadly distributed authenticated users can access polling functionality. The source bundle does not provide CPEs, hosting assumptions, or a full affected-version range.
Exploitation context
The supplied sources do not show active exploitation, and the CVE is not marked as CISA KEV. The vulnerability requires an authenticated attacker, so risk increases where public registration, weak account controls, or many low-trust users exist.
Researcher notes
Evidence is narrow: the CVE description, one GitHub issue, and one commit identify Php-Fusion v9.03.90 fixed in v9.10.00. The affected metadata is incomplete, so avoid broad product or version claims beyond the supplied sources.
Mitigation direction
- Upgrade affected Php-Fusion v9.03.90 systems to v9.10.00 or later.
- Review the linked upstream issue and commit for vendor-confirmed remediation details.
- Inventory PHPFusion deployments and confirm whether polling functionality is enabled.
- Reduce exposure of low-trust authenticated accounts until vendor remediation is applied.
- Monitor vendor guidance for any broader affected-version clarification.
Validation and detection
- Confirm the deployed PHPFusion version is not v9.03.90.
- Verify the installed code includes the upstream fix commit or a later release.
- Identify whether polling functionality is reachable by authenticated low-privilege users.
- Review logs for unusual polling activity from authenticated accounts.
- Document any compensating controls if immediate upgrade is delayed.
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-732: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2021-3172 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
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source materials
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.
Incorrect Permission Assignment for Critical Resource
Incorrect Permission Assignment for Critical Resource represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.