Security readout for executives and security teams
Plain-English summary
Feehi CMS through 2.1.1 reportedly lets an attacker with some access abuse image upload handling to run arbitrary code. This is not listed in CISA KEV, and the source bundle does not identify a confirmed vendor patch. Treat exposed Feehi CMS upload functionality as a meaningful operational risk.
Executive priority
Prioritize review if Feehi CMS is public-facing or accepts uploads from non-administrators. The issue can affect code execution, but current evidence shows medium CVSS severity and no KEV-listed active exploitation.
Technical view
The record describes an authenticated, low-complexity network issue where a crafted image upload in Feehi CMS through 2.1.1 can lead to arbitrary code execution. The CVSS vector requires privileges and user interaction, changes scope, and reports limited confidentiality and integrity impact. The bundled CWE is CWE-79, which does not fully align with the upload/RCE description.
Likely exposure
Exposure is most likely where Feehi CMS through 2.1.1 is deployed and image upload features are reachable by low-privileged or semi-trusted users. Public-facing CMS administration or contributor workflows increase concern.
Exploitation context
The bundle provides a GitHub issue reference but no KEV listing or cited evidence of active exploitation. The CVSS vector indicates exploitation needs network access, low privileges, and user interaction. Do not assume internet-wide exploitation from these sources alone.
Researcher notes
The source data is sparse. The affected CPE fields are not populated, while the description names Feehi CMS through 2.1.1. The CWE value appears inconsistent with the stated arbitrary-code-execution upload issue, so validate against the referenced GitHub issue and upstream project history.
Mitigation direction
- Identify any Feehi CMS deployments and confirm their exact versions.
- Check the Feehi CMS project issue and releases for vendor guidance or fixes.
- Restrict upload privileges to trusted users until remediation is confirmed.
- Review server controls so uploaded media cannot execute as code.
- Monitor CMS upload activity and web logs for suspicious file behavior.
Validation and detection
- Inventory internet-facing and internal Feehi CMS instances.
- Confirm whether any instance is version 2.1.1 or earlier.
- Review CMS roles that can upload images or manage content.
- Check upload directories for unexpected executable or script-like files.
- Verify logs for unusual upload events followed by unexpected requests.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-36573 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
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/liufee/cms/issues/59CVE 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.