Security readout for executives and security teams
Plain-English summary
Affected Beckhoff TwinCAT controllers can be forced into a denial-of-service condition when the Profinet driver processes a malformed UDP packet. The impact is availability loss, not data theft or code execution. This matters most in industrial environments where controller downtime can interrupt production or operations.
Executive priority
Prioritize remediation for production controllers where downtime has safety, operational, or revenue impact. This is a high-availability risk, but the supplied evidence does not show active exploitation or confidentiality impact.
Technical view
CVE-2019-5637 is a CWE-369 divide-by-zero flaw in Beckhoff TwinCAT's Profinet driver. Sources describe network, unauthenticated, low-complexity exploitation with no user interaction and high availability impact. Affected versions are TwinCAT 2 version 2304 and prior, and TwinCAT 3.1 version 4204.0 and prior.
Likely exposure
Exposure is likely limited to Beckhoff TwinCAT deployments using the Profinet driver, especially controllers reachable over networks that can send UDP traffic to the device. The provided sources do not establish broad internet exposure.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not claim active exploitation. Public Rapid7 and Beckhoff materials disclose the issue and describe a malformed UDP packet denial of service, so defenders should treat technical awareness as public.
Researcher notes
The main uncertainty is exact fixed build guidance, which should be taken from Beckhoff's advisory. The vulnerability is availability-only under CVSS, with AV:N/AC:L/PR:N/UI:N and no confidentiality or integrity impact reported in the bundle.
Mitigation direction
- Identify Beckhoff TwinCAT systems using the Profinet driver.
- Review Beckhoff advisory 2019-007 for the vendor-supported fixed versions.
- Upgrade affected TwinCAT 2 and TwinCAT 3.1 installations where applicable.
- Restrict UDP access to controller networks to trusted engineering and operational paths.
- Segment Profinet and controller traffic from general enterprise networks.
Validation and detection
- Inventory TwinCAT versions and compare them with the affected version ranges.
- Confirm whether the Profinet driver is configured on each controller.
- Review network paths that can send UDP traffic to affected controllers.
- Verify applied updates against Beckhoff's advisory, not only package names.
- Check operational logs for unexpected controller resets or service interruptions.
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-369: Exact CWE lookup
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Open ATT&CK lookupCVE-2019-5637 mapping review
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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://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/CVE reference · x_refsource_MISC
- https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-007.pdfCVE 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.
Divide By Zero
Divide By Zero represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.