CVE-2025-36336: IBM watsonx.data Intelligence Cleartext Transmission Vulnerability

Technical summary

CVE-2025-36336 is rooted in CWE-319 (Cleartext Transmission of Sensitive Information). IBM watsonx.data intelligence fails to enforce encryption for data in transit across affected versions. The CVSS 3.1 vector (5.9 MEDIUM, AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) indicates network-accessible exploitation that requires moderate attacker effort (likely specific network positioning or configuration), no authentication, and impacts only confidentiality. The platform runs as a data intelligence layer, meaning intercepted traffic may include query results, metadata, credentials, or analytical datasets.

Business impact

Data breach through man-in-the-middle interception of watsonx.data intelligence communications could expose proprietary analytics, business intelligence, customer data flowing through queries, and authentication tokens. For organizations using watsonx.data in regulated industries (finance, healthcare, energy), such cleartext transmission violates compliance frameworks including HIPAA, PCI-DSS, and SOX. Incident response and notification obligations could follow, along with reputational damage and loss of stakeholder trust in data governance practices.

Affected systems

IBM watsonx.data intelligence versions 5.2.0, 5.2.1, 5.2.2, and 5.3.0 are explicitly affected. The vulnerability also may impact IBM Software Hub if it integrates or distributes watsonx.data intelligence components. Organizations should verify exact version deployment, as later or earlier releases may not be affected; consult IBM security advisories for definitive product scope.

Exploitability

Exploitation requires a network-layer position (AV:N) between a client and the watsonx.data intelligence server—feasible on compromised internal networks, rogue access points, or ISP-level attacks. The high attack complexity (AC:H) suggests the attacker must craft or wait for specific conditions; cleartext interception alone is straightforward, but extracting actionable sensitive data likely depends on traffic patterns and payload structure. No authentication or user interaction is required. Public exploit code is not tracked in KEV, and exploitation is not yet weaponized at scale, but the attack surface is well-understood for determined adversaries.

Remediation

Upgrade IBM watsonx.data intelligence to a patched version released after the vulnerability disclosure. IBM should provide specific version guidance in their advisory—verify the minimum safe build number against the official IBM Security Notice. Interim mitigations include restricting network access to watsonx.data intelligence servers, enforcing VPN or IPSec tunnels for all client-server communication, and implementing network segmentation to isolate data intelligence traffic from untrusted networks.

Patch guidance

Check IBM's official security advisory for watsonx.data intelligence to identify the patched version. Apply updates in a controlled staging environment first, especially given watsonx.data's role in analytics pipelines. Plan downtime or use rolling restarts if the deployment supports it. Verify that all client connections (reporting tools, ETL integrations, API consumers) are reconfigured to use the patched instances. After patching, confirm that encryption is enforced by inspecting network traffic or enabling audit logging for protocol versions.

Detection guidance

Monitor watsonx.data intelligence network traffic for unencrypted or plaintext protocol exchanges using network IDS/IPS or packet inspection tools (Wireshark, tcpdump, NetFlow analysis). Flag any connections not using TLS/HTTPS. Review firewall and proxy logs for non-standard or direct connections to watsonx.data intelligence ports. Implement SSL/TLS inspection and decryption policies to detect protocol downgrades or failures. Enable audit logging on the application to record authentication and query events, correlating with network logs to identify suspicious data access patterns.

Why prioritize this

Although CVSS 5.9 (MEDIUM) suggests moderate severity, the vulnerability should be prioritized based on data sensitivity and regulatory exposure. If watsonx.data intelligence stores or processes regulated or proprietary data, confidentiality breaches are business-critical. The lack of integrity or availability impact (I:N, A:N) is offset by the fact that intellectual property and customer data loss can be existential. Organizations in regulated verticals or with high-value analytics operations should treat this as HIGH priority internally; others may follow standard medium-priority patching cadence.

Risk score, explained

The CVSS 5.9 MEDIUM score reflects a network-accessible cleartext transmission flaw with high confidentiality impact but no integrity or availability compromise. High attack complexity (AC:H) prevents a higher score; the attacker must position themselves on the network path and likely intercept the right traffic flows. For watsonx.data intelligence specifically, the risk may be understated by CVSS because data intelligence platforms often handle high-value, concentrated datasets. Security teams should adjust their internal risk models upward if the platform processes sensitive or regulated information, even though the base CVSS remains 5.9.

Frequently asked questions