CVE-2025-65865Public exploitNetwork attack vector

Remote crash via wrapped DATA_FRAG payload length

Published Dec 23, 2025 · Updated Dec 23, 2025

Integer underflow in Fast DDS 3.3 allows remote attackers to crash a participant by sending a crafted RTPS DATA_FRAG submessage. MessageReceiver::proc_Submsg_DataFrag subtracts octetsToInlineQos and inlineQosSize from a smaller submessageLength without rejecting the result, wrapping payload_size to a large uint32_t value. The attacker must observe the target GUID and entityId and reach its UDP RTPS listener; the wrapped length advances msg->pos out of bounds and drives an oversized memcpy that terminates the process.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Integer underflow in Fast DDS 3.3 allows remote attackers to crash a participant by sending a crafted RTPS DATA_FRAG submessage. MessageReceiver::proc_Submsg_DataFrag subtracts octetsToInlineQos and inlineQosSize from a smaller submessageLength without rejecting the result, wrapping payload_size to a large uint32_t value. The attacker must observe the target GUID and entityId and reach its UDP RTPS listener; the wrapped length advances msg->pos out of bounds and drives an oversized memcpy that terminates the process.

The record

CVE
CVE-2025-65865
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-190Integer Overflow or Wraparound
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo