Security readout for executives and security teams
Plain-English summary
A flaw in Zabbix's JSON parser can let a highly privileged attacker send crafted data that crashes a Zabbix Server or Proxy. The main business risk is monitoring disruption, which can reduce visibility into outages or security events.
Executive priority
Treat as a scheduled but real remediation item. It is not evidenced as actively exploited, but a crash of monitoring infrastructure can blind operations during incidents.
Technical view
CVE-2023-29451 is a CWE-20 input validation issue in Zabbix 6.0, 6.2, 6.4, and 7.0.0alpha1. A specially crafted string can cause a buffer overrun in the JSON parser library, leading to Zabbix Server or Proxy crash. CVSS 3.1 is 4.7 with network attack vector and high privileges required.
Likely exposure
Exposure is most likely where affected Zabbix Server or Proxy versions are reachable by highly privileged users or integrations that can submit JSON-handled data.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The CVSS vector requires high privileges, which lowers broad internet risk but still matters for insider, compromised admin, or integration-token scenarios.
Researcher notes
Evidence is limited to the CVE summary, Zabbix issue reference, and Debian LTS reference. Do not assume affected components beyond Zabbix Server and Proxy, and do not infer fixed version numbers not present in the sources.
Mitigation direction
- Identify all Zabbix Server and Proxy instances and their exact versions.
- Check Zabbix guidance for fixed versions or supported upgrade paths.
- For Debian LTS deployments, review the Debian advisory and apply listed updates.
- Restrict privileged Zabbix access to trusted users, networks, and integrations.
- Monitor Zabbix Server and Proxy processes for unexpected crashes or restarts.
Validation and detection
- Confirm whether any instance runs Zabbix 6.0, 6.2, 6.4, or 7.0.0alpha1.
- Review package or deployment records for vendor or Debian security updates.
- Check Zabbix Server and Proxy logs for crash patterns or abnormal restarts.
- Validate privileged accounts and API integrations with Zabbix access.
- Document compensating access controls where upgrades are pending.
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-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2023-29451 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
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
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:H/UI:N/S:U/C:L/I:L/A:L1.23.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://support.zabbix.com/browse/ZBX-22587CVE reference
- https://lists.debian.org/debian-lts-announce/2023/08/msg00027.htmlCVE 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.