Memory disclosure and service interruption via RTPS underflow
Published Jun 17, 2026 · Updated Jun 17, 2026
Integer underflow in RTI Connext Micro 4.0.0 and later before 4.3.0 allows remote attackers to read memory or interrupt service via RTPS messages. The Core Libraries underflow an integer while parsing an untrusted RTPS data submessage, causing a buffer overread. The flaw requires no authentication or user interaction, although RTI reports no impact when certain Security features are enabled.
Summary
What happened
Integer underflow in RTI Connext Micro 4.0.0 and later before 4.3.0 allows remote attackers to read memory or interrupt service via RTPS messages. The Core Libraries underflow an integer while parsing an untrusted RTPS data submessage, causing a buffer overread. The flaw requires no authentication or user interaction, although RTI reports no impact when certain Security features are enabled.
The record
- CVE
- CVE-2026-30803
- Published
- Jun 17, 2026
- Updated
- Jun 17, 2026
- Vendor
- Real-Time Innovations
- Product
- Connext Micro
- Classifications
- CWE-191, CAPEC-540, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 17, 2026CVE publishedPublication date reported by the CVE source.
- Jun 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.0.0 <4.3.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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