CVE-2025-63829Public exploitNetwork attack vector

Service hang via overflowing fraction increment

Published Nov 18, 2025 · Updated Nov 18, 2025

Integer overflow in eProsima Fast-DDS 3.3.0 and earlier allows remote attackers to hang a process through Time_t fraction conversion. The Time_t::fraction() getter converts nanoseconds to a 32-bit fraction, then repeatedly increments and reconverts that value until it exactly matches the original nanoseconds. Unauthenticated network reachability is reported; a crafted time value can trap the processing thread and interrupt the consuming service.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in eProsima Fast-DDS 3.3.0 and earlier allows remote attackers to hang a process through Time_t fraction conversion. The Time_t::fraction() getter converts nanoseconds to a 32-bit fraction, then repeatedly increments and reconverts that value until it exactly matches the original nanoseconds. Unauthenticated network reachability is reported; a crafted time value can trap the processing thread and interrupt the consuming service.

The record

CVE
CVE-2025-63829
Published
Nov 18, 2025
Updated
Nov 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-835, CWE-190, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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?

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

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
7.5NIST NVDCVSS: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-835Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service

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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