Security readout for executives and security teams
Plain-English summary
CVE-2021-34076 describes a high-severity file upload flaw reported in PHPOK 5.7.140. A crafted ZIP upload could let an attacker run arbitrary code and gain elevated privileges. The sources do not name a vendor fix or broader affected version range.
Executive priority
Prioritize discovery and containment for any exposed PHPOK 5.7.140 systems because successful abuse could lead to full application compromise. Urgency is high, but evidence is limited on active exploitation and official remediation.
Technical view
The CVE maps to CWE-434 and has CVSS 3.1 score 8.8: network-reachable, low complexity, no privileges required, but user interaction required. Impact is high across confidentiality, integrity, and availability. Structured affected-product data is incomplete, listing n/a despite the description naming PHPOK 5.7.140.
Likely exposure
Exposure is most relevant to organizations running PHPOK 5.7.140 with workflows that accept or process ZIP uploads. The source bundle does not provide CPEs, deployment details, or a complete affected-version list.
Exploitation context
The CVE states attackers can use a crafted ZIP upload to achieve arbitrary code execution. CISA KEV status is false in the bundle, and no cited source confirms active exploitation. Treat exploitation evidence as incomplete.
Researcher notes
The public record is sparse: one GitHub issue reference and CVE metadata. The affected product fields are not populated, so version scoping should be verified against PHPOK release history or vendor guidance before broad conclusions.
Mitigation direction
- Inventory PHPOK deployments and identify any version 5.7.140 instances.
- Check PHPOK or project guidance for fixed versions or official mitigations.
- Restrict ZIP upload capability to trusted users where operationally possible.
- Harden upload storage so uploaded files cannot execute as server code.
- Review exposed PHPOK instances for suspicious uploaded files or unexpected code changes.
Validation and detection
- Confirm whether any internet-facing systems run PHPOK 5.7.140.
- Review application routes or modules that accept ZIP uploads.
- Check access logs for unusual upload activity around PHPOK endpoints.
- Inspect upload and extraction directories for unexpected executable files.
- Verify whether an official vendor fix has been applied when identified.
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-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-34076 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/HolaAsuka/CVE/issues/1CVE 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.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.