Security readout for executives and security teams
Plain-English summary
A flaw in Honeywell C300 controller message handling can allow an unauthenticated network attacker to cause a denial of service through a buffer overflow condition. The business impact is availability disruption to affected industrial control environments. The source bundle points to Honeywell upgrade and versioning guidance, but does not provide a specific fixed version.
Executive priority
Treat this as a high-priority OT availability risk, especially in plants where C300 controllers support critical operations. The immediate goal is exposure reduction and vendor-guided upgrade planning, not emergency assumptions about exploitation. Prioritize sites with weak segmentation or remote connectivity into controller networks.
Technical view
CVE-2023-26597 is a high-severity Honeywell C300 controller DoS issue. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating network reachability, low attack complexity, no privileges, no user interaction, and availability-only impact. The source describes specially crafted controller messaging causing a buffer overflow during error response handling.
Likely exposure
Exposure is most relevant where Honeywell C300 controllers on the listed versions are reachable over networks that can send controller messages. Internet exposure is not stated in the sources. Environments with flat OT networks, weak segmentation, or remote access into control networks should prioritize inventory validation.
Exploitation context
The bundle does not cite active exploitation, and KEV status is false. The vulnerability is still operationally serious because the CVSS vector indicates unauthenticated network access and low complexity, with high availability impact. No exploit details or public weaponization evidence are provided in the supplied sources.
Researcher notes
The source data has limited product-detail depth and duplicates Honeywell C300 affected entries. It names a controller DoS from buffer overflow handling of specially crafted messages, mapped to CWE-400. It does not include packet specifics, a fixed version, exploit status, or Honeywell bulletin details beyond directing readers to Honeywell security notification guidance.
Mitigation direction
- Check Honeywell’s security notification for official upgrade and versioning recommendations.
- Identify and prioritize Honeywell C300 controllers on listed affected versions.
- Restrict network paths to controller management and process-control interfaces.
- Review OT remote access paths that could reach C300 controller networks.
- Monitor Honeywell advisory channels for fixed-version clarification.
Validation and detection
- Inventory Honeywell C300 assets and record firmware or software versions.
- Compare versions against 501.1, 510.1, 511.1, 520.1, and 520.2.
- Confirm controller networks are segmented from enterprise and internet-accessible systems.
- Review firewall rules for unnecessary access to controller communication paths.
- Check incident logs for unexplained controller resets or availability events.
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-400: 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-2023-26597 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.