What is CVE-2020-18734?

CVE-2020-18734 is a high-severity vulnerability in Eclipse Cyclone Data Distribution Service, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-08-23.

How severe is CVE-2020-18734?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Eclipse Cyclone Data Distribution Service

CVE-2020-18734

A stack buffer overflow in /ddsi/q_bitset.h of Eclipse IOT Cyclone DDS Project v0.1.0 causes the DDS subscriber server to crash.

Vulnerability class: Buffer Overflow

Published 2021-08-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.5th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Eclipse Cyclone Data Distribution Service — versions 0.1.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/eclipse-cyclonedds/cyclonedds/issues/476 (Exploit, Third Party Advisory, Issue Tracking)
github.com/eclipse-cyclonedds/cyclonedds (Third Party Advisory)
projects.eclipse.org/projects/iot.cyclonedds (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-18734?: CVE-2020-18734 is a high-severity vulnerability in Eclipse Cyclone Data Distribution Service, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-08-23.
How severe is CVE-2020-18734?: High severity. CVSS v3 base score is 7.5 out of 10.