CVE-2023-39534Public exploitNetwork attack vector

Remote service crash via GAP sequence underflow

Published Aug 11, 2023 · Updated Feb 13, 2025

Reachable assertion in eProsima Fast DDS before 2.6.5 and 2.7.0 through 2.9.1 allows remote attackers to crash the process. StatefulReader::processGapMsg subtracts one from a zero GAP bitmap base, causing SequenceNumber_t::operator- to assert instead of rejecting the invalid sequence range. An unauthenticated attacker that can send an RTPS packet after participant discovery can terminate the receiving process, interrupting its service.

CVSS severity7.5
High
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in eProsima Fast DDS before 2.6.5 and 2.7.0 through 2.9.1 allows remote attackers to crash the process. StatefulReader::processGapMsg subtracts one from a zero GAP bitmap base, causing SequenceNumber_t::operator- to assert instead of rejecting the invalid sequence range. An unauthenticated attacker that can send an RTPS packet after participant discovery can terminate the receiving process, interrupting its service.

The record

CVE
CVE-2023-39534
Published
Aug 11, 2023
Updated
Feb 13, 2025
Vendor
eProsima
Product
Fast DDS
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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.

  1. Affected versionversion=< 2.6.5
  2. Affected versionversion=>= 2.7.0, < 2.9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

eProsima · Fast DDSversion=< 2.6.5; version=>= 2.7.0, < 2.9.2

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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