Security readout for executives and security teams
Plain-English summary
CVE-2021-35502 is a sanitization flaw in MISP 2.4.144. Certain data rendered through the generic template index field was not sanitized. The public bundle does not provide CVSS, CWE, or impact detail, so urgency depends on whether the affected MISP version is deployed and exposed to untrusted content.
Executive priority
Treat this as a targeted hygiene fix for MISP environments rather than a confirmed emergency. Prioritize quickly if MISP is externally reachable, heavily integrated with untrusted feeds, or used by many analysts.
Technical view
The issue is in MISP's app/View/Elements/genericElements/IndexTable/Fields/generic_field.ctp, where certain generic-template:index data was not sanitized in version 2.4.144. The source bundle references a MISP commit as the available remediation evidence, but does not define affected version ranges, exploit prerequisites, or final security impact.
Likely exposure
Exposure is most likely limited to organizations running MISP 2.4.144, especially where generic template index views can render data supplied by users, integrations, or feeds. The bundle does not identify affected CPEs or versions beyond 2.4.144.
Exploitation context
The CVE is not listed as KEV in the supplied bundle, and no cited source claims active exploitation. The available evidence supports an unsanitized rendering flaw, but not exploit maturity, exploitation in the wild, or weaponized public exploit availability.
Researcher notes
Evidence is sparse: no CVSS, CWE, CPE, affected range, or exploit detail is included. Analysis should remain anchored to MISP 2.4.144 and the referenced commit. Avoid assuming broader XSS impact unless confirmed by vendor advisory or code review.
Mitigation direction
- Identify all deployed MISP instances and their exact versions.
- If running MISP 2.4.144, review the referenced MISP commit and vendor release guidance.
- Upgrade to an official MISP release containing the sanitization fix.
- Restrict administrative and analyst access to MISP while remediation is pending.
- Review custom generic templates for unsafe rendering of untrusted data.
Validation and detection
- Confirm whether app/View/Elements/genericElements/IndexTable/Fields/generic_field.ctp matches the fixed MISP code.
- Verify no production MISP instance remains on version 2.4.144.
- Review logs for suspicious activity around generic template index views.
- Test affected views with benign unsafe characters to confirm output is safely encoded.
- Document the fixed version and evidence for vulnerability management closure.
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.
CVE-2021-35502 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/MISP/MISP/commit/2fde6476dc3173affc61874ba2adb35400a8fda5CVE reference · x_refsource_MISC
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.