CVE-2021-32977Network attack vector

AutoBuild data tampering via unverified signatures

Published Apr 4, 2022 · Updated Apr 16, 2025

Improper signature verification in AVEVA System Platform 2017 through 2020 R2 P01 allows remote authenticated users to alter AutoBuild data. The AutoBuild component accepts data whose cryptographic signature is absent or incorrectly validated; AVEVA has not disclosed the exact data format or verification routine. High-privilege access and an enabled AutoBuild service are required; AVEVA states that chaining the AutoBuild flaws enables system-privilege code execution or denial of service.

CVSS severity7.2
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in AVEVA System Platform 2017 through 2020 R2 P01 allows remote authenticated users to alter AutoBuild data. The AutoBuild component accepts data whose cryptographic signature is absent or incorrectly validated; AVEVA has not disclosed the exact data format or verification routine. High-privilege access and an enabled AutoBuild service are required; AVEVA states that chaining the AutoBuild flaws enables system-privilege code execution or denial of service.

The record

CVE
CVE-2021-32977
Published
Apr 4, 2022
Updated
Apr 16, 2025
Vendor
AVEVA
Product
AVEVA System Platform
Classifications
CWE-347
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 4, 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=2017 <=2020 R2 P01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

AVEVA · AVEVA System Platformversion=2017 <=2020 R2 P01

Published CVSS scores

7.2ICS-CERTCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV:N/AC:L/Au:S/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature

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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