Security readout for executives and security teams
Plain-English summary
CVE-2023-24480 affects Honeywell C300 controllers. A crafted or malformed server message can trigger a controller stack overflow while decoding, causing denial of service. The CVSS score is critical at 9.8, but the provided sources do not show known active exploitation.
Executive priority
Prioritize this for operational technology environments because a controller DoS can disrupt industrial processes. Start with asset identification and Honeywell upgrade guidance before emergency changes.
Technical view
The flaw is described as a controller DoS stack overflow during message decoding from the server. The CVSS vector is network-accessible, low complexity, no privileges, and no user interaction. Affected Honeywell C300 versions listed are 501.1, 510.1, 511.1, 520.1, and 520.2.
Likely exposure
Exposure is most relevant in environments running Honeywell C300 controllers on the listed versions. Risk depends on whether untrusted or compromised systems can send messages to the controller over reachable networks.
Exploitation context
The source bundle does not cite CISA KEV listing or public exploitation. Treat this as high-impact because exploitation requires no privileges or user interaction in the CVSS record, but do not assume exploitation is occurring without new evidence.
Researcher notes
The public bundle gives limited technical detail: stack overflow during server-message decoding, affected C300 versions, and CVSS 9.8. It does not provide packet formats, exploit status, or a specific fixed version in the supplied text.
Mitigation direction
- Inventory Honeywell C300 controllers and record firmware or software versions.
- Obtain Honeywell’s security notification through official process.honeywell.com channels.
- Apply Honeywell’s recommended upgrade and version guidance.
- Limit controller communication paths to trusted process-control systems.
- Increase monitoring for controller resets, faults, or unusual server-originated traffic.
Validation and detection
- Confirm whether any C300 controllers run versions 501.1, 510.1, 511.1, 520.1, or 520.2.
- Verify implemented versions match Honeywell’s security notification recommendations.
- Review network paths that can send server messages to controllers.
- Check incident logs for unexplained controller denial-of-service symptoms.
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
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CWE-116: 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 lookupCVE-2023-24480 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://process.honeywell.com/CVE 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 Encoding or Escaping of Output
Improper Encoding or Escaping of Output represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.