Security readout for executives and security teams
Plain-English summary
CVE-2021-35301 is an access-control flaw in Zammad versions 1.0.x through 4.0.0. A remote attacker could obtain sensitive information through the Ticket Article detail view. The supplied sources do not provide CVSS scoring, exploitation evidence, or detailed preconditions.
Executive priority
Treat as a near-term information disclosure risk for affected Zammad systems. Priority depends on ticket data sensitivity and internet exposure, but absence of KEV evidence lowers emergency urgency.
Technical view
The vulnerability is described as incorrect access control affecting the Zammad Ticket Article detail view. Impact is sensitive information exposure. The source bundle identifies affected versions as Zammad 1.0.x up to 4.0.0, but does not include CWE, CVSS, authentication requirements, or attack complexity.
Likely exposure
Organizations running Zammad 1.0.x through 4.0.0 may be exposed, especially where ticket data contains customer, employee, support, or operational information. Exposure cannot be narrowed further from the supplied sources.
Exploitation context
The issue is remotely reachable according to the CVE description. CISA KEV status is false, and the provided sources do not show active exploitation or public weaponization details.
Researcher notes
Key unknowns remain: CVSS, CWE mapping, authentication requirements, exact fixed version, and practical exploit conditions are not present in the provided bundle. Use the vendor advisory as the authoritative remediation source.
Mitigation direction
- Check the Zammad advisory for vendor-supported upgrade or mitigation guidance.
- Identify and prioritize any Zammad instances running versions 1.0.x through 4.0.0.
- Restrict access to Zammad until affected instances are updated or vendor guidance is applied.
- Review ticket data sensitivity to understand potential disclosure impact.
Validation and detection
- Inventory Zammad deployments and record exact installed versions.
- Confirm whether any instance is version 1.0.x through 4.0.0.
- Review access controls around Ticket Article detail views.
- Check logs for unusual ticket article access patterns, where available.
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-2021-35301 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://zammad.com/en/advisories/zaa-2021-05CVE reference · x_refsource_CONFIRM
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.