CVE-2021-38423Network attack vector

Application crash via undersized network-data buffer

Published May 5, 2022 · Updated Apr 16, 2025

Buffer-size miscalculation in GurumNetworks GurumDDS all versions allows attackers to crash DDS applications via crafted network data. GurumDDS allocates a buffer using an incorrectly calculated size before handling the received data, allowing the input to overflow it. The public record does not identify the affected function or packet structure; successful triggering produces a segmentation fault that interrupts the hosting process.

CVSS severity9.8
Critical
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer-size miscalculation in GurumNetworks GurumDDS all versions allows attackers to crash DDS applications via crafted network data. GurumDDS allocates a buffer using an incorrectly calculated size before handling the received data, allowing the input to overflow it. The public record does not identify the affected function or packet structure; successful triggering produces a segmentation fault that interrupts the hosting process.

The record

CVE
CVE-2021-38423
Published
May 5, 2022
Updated
Apr 16, 2025
Vendor
GurumNetworks
Product
GurumDDS
Classifications
CWE-131, T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=all versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

GurumNetworks · GurumDDSversion=all versions

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.6ICS-CERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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