CVE-2026-7300: RTI Connext Professional Buffer Overflow DoS Vulnerability

Technical summary

The vulnerability exists in the Web Integration Service component of RTI Connext Professional due to improper input validation on buffer operations (CWE-120). The flaw allows an authenticated, network-adjacent attacker to trigger a buffer overflow condition by supplying oversized input without proper bounds checking. The attack requires valid credentials and network access to the Web Integration Service endpoint. Exploitation results in service termination, disrupting filter operations and message routing until the service is restarted.

Business impact

Organizations using Connext Professional for DDS-based middleware face potential service interruptions if this vulnerability is exploited. Real-time communication pipelines may be disrupted, affecting dependent applications that rely on continuous data flow. While data confidentiality and integrity are not compromised, availability impact could cascade to dependent systems. Recovery requires manual service restart, leading to operational delays.

Affected systems

RTI Connext Professional versions 7.4.0 through 7.x (before 7.4.0 patch), 7.0.0 through 7.3.1.3, and 6.1.2 through 6.1.x are affected. The vulnerability is isolated to the Web Integration Service component. Only authenticated users with network access to the service can trigger the condition. Earlier versions and non-Web-Integration deployments are not impacted.

Exploitability

Exploitability is moderate. The attack requires valid authentication credentials and network access to the Web Integration Service—a meaningful barrier in air-gapped or internally segmented networks. The network attack vector, low complexity, and no user interaction requirement lower the friction once credentials are obtained. The lack of public exploit code and absence from the CISA KEV catalog indicate low active exploitation at this time, though the straightforward nature of buffer overflow attacks means tools could be developed.

Remediation

Upgrade Connext Professional to patched versions: version 7.x (at or after the confirmed fixed build), 7.3.1.3 or later for the 7.0–7.3 line, or 6.1.x (at or after the confirmed fixed build) for the 6.1 line. Verify exact patch versions against RTI's security advisory. As an interim measure, restrict network access to the Web Integration Service using network ACLs or firewall rules, limiting exposure to trusted internal networks and authenticated users only.

Patch guidance

Contact RTI or consult their security advisory for exact patched version numbers and availability timelines. Testing should prioritize environments where the Web Integration Service is internet-facing or handles untrusted network traffic. Rollout should be staged to validate integration with dependent applications before full deployment, given the criticality of real-time systems. Plan for brief service downtime during patching.

Detection guidance

Monitor Connext Professional Web Integration Service logs for unexpected service crashes or restarts correlated with unusual input patterns. Network-level detection should flag repeated or large HTTP requests to Web Integration Service endpoints from authenticated users, especially if request sizes exceed known legitimate message boundaries. Intrusion detection systems should alert on buffer overflow attack signatures targeting RTI services. Track service availability metrics for unexplained outages.

Why prioritize this

This vulnerability merits timely but not emergency remediation. The CVSS 6.5 MEDIUM score reflects availability impact without confidentiality or integrity compromise. Prioritize patching if the Web Integration Service is externally accessible, handles semi-trusted users, or supports business-critical real-time workflows. Organizations with strict internal-only access and strong credential hygiene may deprioritize relative to higher-CVSS issues, but should still plan upgrade windows within 60–90 days.

Risk score, explained

The CVSS 3.1 score of 6.5 (MEDIUM) is driven by the high availability impact (A:H) balanced against the requirement for valid authentication (PR:L) and network access (AV:N). The absence of confidentiality or integrity impact (C:N, I:N) prevents a higher rating. Organizations deploying Connext in high-availability or safety-critical contexts may justify elevated internal risk scores due to operational dependencies not captured in CVSS.

Frequently asked questions