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Fencer Vulns
medium 6.6

CVE-2021-38423 json

GurumDDS Heap-based Incorrect Calculation of Buffer Size

published 2022-05-05 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24875

cvss
6.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

All versions of GurumDDS improperly calculate the size to be used when allocating the buffer, which may result in a buffer overflow.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-315-02 updated cvss 6.6

Multiple Data Distribution Service (DDS) Implementations (Update A)

  • Eclipse CycloneDDS <0.8.0 eProsima Fast DDS <2.4.0 GurumNetworks GurumDDS Object Computing, Inc. (OCI) Object Computing Inc. (OCI) OpenDDS <3.18.1 Real-Time Innovations (RTI) Connext DDS Professional and Connext DDS Secure >=4.2x, <6.1.0 Real-Time Innovations (RTI) RTI Connext DDS Micro >=3.0.0
    +1 more products
    TwinOaks Computing CoreDX DDS <5.9.1
    affected: mitigation “Eclipse recommends users apply the latest CycloneDDS patches.” projects.eclipse.org

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • GurumNetworks GurumDDS

Classification

Weakness
  • CWE-131 Incorrect Calculation of Buffer Size

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.