How severe is CVE-2020-18734?

CVE-2020-18734 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-18734 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-18734?

CVE-2020-18734 affects Eclipse Cyclone Data Distribution Service. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-18734?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-18734 published?

CVE-2020-18734 was published on 2021-08-23 and last updated on 2026-06-17.

CVE-2020-18734

CVE-2020-18734 is a high-severity vulnerability in Eclipse Cyclone Data Distribution Service with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Eclipse Cyclone Data Distribution Service
Published: 2021-08-23
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-18734?: CVE-2020-18734 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-18734 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-18734?: CVE-2020-18734 affects Eclipse Cyclone Data Distribution Service. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-18734?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-18734 published?: CVE-2020-18734 was published on 2021-08-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eclipse:cyclone_data_distribution_service:0.1.0:*:*:*:*:*:*:*

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