CVE-2021-32963Network attack vector

Remote denial of service via malformed SuiteLink commands

Published Sep 23, 2021 · Updated Sep 17, 2024

Null pointer dereference in AVEVA SuiteLink Server allows remote attackers to interrupt service via crafted commands 0x03 or 0x10. The server dereferences a null pointer while parsing those command packets, causing the SuiteLink process to crash. No authentication or user interaction is required, and the documented impact is service interruption; AVEVA notes that remote code execution is only theoretical with no proof of concept.

CVSS severity7.5
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in AVEVA SuiteLink Server allows remote attackers to interrupt service via crafted commands 0x03 or 0x10. The server dereferences a null pointer while parsing those command packets, causing the SuiteLink process to crash. No authentication or user interaction is required, and the documented impact is service interruption; AVEVA notes that remote code execution is only theoretical with no proof of concept.

The record

CVE
CVE-2021-32963
Published
Sep 23, 2021
Updated
Sep 17, 2024
Vendor
AVEVA
Product
AVEVA Communication Drivers Pack
Classifications
CWE-476, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=unspecified <=R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AVEVA · AVEVA Communication Drivers Packversion=unspecified <=R2
AVEVA · AVEVA System Platformversion=unspecified <=R2 P01
AVEVA · AVEVA Batch Managementversion=unspecified <=2020
AVEVA · AVEVA InTouch HMIversion=unspecified <=R2 P01
AVEVA · AVEVA Historianversion=unspecified <=R2 P01
AVEVA · AVEVA Manufacturing Execution Systemversion=unspecified <=R2

Published CVSS scores

7.5AVEVACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.002Service Exhaustion

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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