VulnerabilityPublished 18 Nov 2025

CVE-2025-63829: Fast-DDS · Infinite Loop

Affects Fast-DDSSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 27% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
GitHubeprosima/Fast-DDS`pkg:github/eprosima/Fast-DDS`Other threats	Affected <=3.3	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

1. Monitor network traffic and system resource usage for signs of abnormal CPU or memory consumption that could indicate exploitation attempts. 2. Restrict network access to Fast-DDS services using firewalls and network segmentation to limit exposure to untrusted networks. 3. Implement strict access controls and isolate Fast-DDS nodes within secure network zones. 4. Engage with eProsima or relevant vendors to obtain updates or patches as soon as they become available and apply them promptly. 5. Conduct code reviews and testing for integer overflow and loop conditions in custom implementations or integrations of Fast-DDS. 6. Use runtime protections such as watchdog timers or process supervisors to detect and recover from infinite loops or hangs. 7. Educate operational technology and security teams about this vulnerability to ensure rapid response if exploitation is suspected. 8. Consider deploying intrusion detection systems tuned to detect anomalous behavior related to Fast-DDS communications.

Description

eProsima Fast-DDS v3.3 and before has an infinite loop vulnerability caused by integer overflow in the Time_t:: fraction() function.

Impact

For European organizations, the primary impact of CVE-2025-63829 is potential denial of service or resource exhaustion due to the infinite loop in Fast-DDS processes. This can disrupt critical real-time communication in sectors such as automotive manufacturing, aerospace control systems, robotics, and industrial automation, where Fast-DDS is commonly deployed. Although the vulnerability does not directly compromise data integrity or availability, the infinite loop can degrade system responsiveness or cause service interruptions, impacting operational continuity. Confidentiality impact is limited but present, as the CVSS vector indicates some potential information exposure. Organizations relying on Fast-DDS for safety-critical or time-sensitive applications may face increased operational risks, including delays or failures in automated processes. The lack of patches and known exploits means the threat is currently theoretical but could become practical if attackers develop exploits. European entities with exposed Fast-DDS services on public or poorly segmented networks are at higher risk.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Nov 2025, 17:26 UTC

WeaknessesCWE-835

Technical details

References

Community reviews

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