No exploitation reportedFix available

CVE-2021-32977

Q: Is CVE-2021-32977 actively exploited?

Active exploitation of CVE-2021-32977 has not been confirmed. Its EPSS score was 0.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-32977?

CVE-2021-32977 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2022-04-04
Fixed in2020
WeaknessCWE-347

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

AVEVA System Platform versions 2017 through 2020 R2 P01 does not verify, or incorrectly verifies, the cryptographic signature for data.

Timeline

dates in UTC

2022-04-0420:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-32977?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-32977?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Aveva system platform

Branch	Affected	Fixed in	Source
2020.x	≥ 2017, < 2020	2020	NVD
2020.x	= 2020	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-180-05 CISA1 known affected
AVEVA System Platform (Update A)
AVEVA reports the vulnerability affects AVEVA System Platform: versions 2017 through 2020 R2 P01 (inclusive)

Full record on NVD

Fix

Update Aveva system platform to 2020
Mitigation from the vendor CISA ICSA-21-180-05 · 1 productAVEVA recommends organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
Mitigation from the vendor CISA ICSA-21-180-05 · 1 productAutoBuild service is intended to be used only on the GR Node of System Platform during configuration. If the AutoBuild service is enabled on any Runtime nodes, it should be disabled. Furthermore, if the AutoBuild functionality is not used on the GR Node, the AutoBuild service can be disabled on the…
Mitigation from the vendor CISA ICSA-21-180-05 · 1 productAVEVA recommends users who need to continually use the AutoBuild functionality and cannot disable it in System Platform Versions 2017 through 2020 R2 P01 (inclusive) are affected by the vulnerabilities and should first upgrade to one of the System Platform versions listed below, then apply the corr…
Mitigation from the vendor CISA ICSA-21-180-05 · 1 productSystem Platform 2020 R2 P01, 2020 R2, 2020: Apply AVEVA Communication Drivers Pack 2020 R2.1
Mitigation from the vendor CISA ICSA-21-180-05 · 1 productSystem Platform 2017 U3 SP1 P01:
Mitigation from the vendor CISA ICSA-21-180-05 · 1 productFirst apply AVEVA Communication Drivers Pack 2020 R2 AVEVA notes that Activated Licensing is required to apply AVEVA Communication Drivers Pack 2020 R2 on top of System Platform 2017 U3 SP1 P01. For information on AVEVA license compatibility, please contact AVEVA Customer Support

Advisories and patches

www.aveva.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-04-16
OpenCVESSVC decisionnone—
CNACVSS 3.17.2read 2026-10-23
NVDCVSS 3.17.2read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
CNAweakness (CWE)CWE-347read 2026-10-23
NVDweakness (CWE)CWE-347read 2026-10-23
FIRST EPSSEPSS score0.6 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2022-04-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-32977?

AVEVA System Platform versions 2017 through 2020 R2 P01 does not verify, or incorrectly verifies, the cryptographic signature for data.

Is CVE-2021-32977 actively exploited?

Active exploitation of CVE-2021-32977 has not been confirmed. Its EPSS score was 0.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-32977?

CVE-2021-32977 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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