Security readout for executives and security teams
Plain-English summary
This vulnerability can let an unauthenticated network actor disrupt AVEVA SuiteLink Server availability in listed AVEVA industrial software products. The public data points to denial of service, not data theft or integrity loss. Because these products often support operational technology workflows, treat service outages as business-impacting even without evidence of active exploitation.
Executive priority
Prioritize this as a high availability risk for environments relying on AVEVA SuiteLink-connected operations. It is not described as data compromise, but disruption to industrial software services can still affect production visibility or workflows. Remediation urgency should track operational dependency and network exposure.
Technical view
CVE-2021-32999 is CWE-755 improper handling of exceptional conditions in AVEVA SuiteLink Server while processing command 0x01. CVSS 3.1 is 7.5, network attack vector, low complexity, no privileges or user interaction, and high availability impact only. Affected entries include AVEVA 2020 product lines and AVEVA MES 2014.
Likely exposure
Exposure is most likely where affected AVEVA products are deployed and SuiteLink Server is reachable over a network. Listed products include System Platform 2020, InTouch 2020, Historian 2020, Communication Drivers Pack 2020, Batch Management 2020, and MES 2014. Exact affected versions are not specified in the provided bundle.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates remote, unauthenticated availability impact with low attack complexity. Public evidence here is insufficient to claim exploit availability, exploitation in the wild, or specific crash behavior beyond the described exceptional-condition handling issue.
Researcher notes
Evidence is limited to CVE metadata and the AVEVA bulletin reference. The affected version fields are unspecified in the bundle, so validation should focus on installed product families, SuiteLink presence, and vendor bulletin comparison. Do not infer additional affected products, exploitation, or fixes without AVEVA confirmation.
Mitigation direction
- Review AVEVA Security Bulletin AVEVA-2021-003 for supported updates and vendor mitigations.
- Inventory and prioritize listed AVEVA 2020 and MES 2014 deployments.
- Restrict SuiteLink Server access to trusted OT hosts and management networks.
- Monitor SuiteLink service health until vendor guidance is applied.
- Coordinate compensating controls with OT operations before production changes.
Validation and detection
- Identify hosts running the listed AVEVA products and SuiteLink Server components.
- Confirm deployed versions against AVEVA-2021-003 and asset records.
- Check whether SuiteLink Server is reachable from untrusted networks or IT zones.
- Review service monitoring for unexplained SuiteLink availability interruptions.
- Document unresolved version ambiguity for vendor or integrator follow-up.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-755: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-32999 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.aveva.com/content/dam/aveva/documents/support/cyber-security-updates/SecurityBulletin_AVEVA-2021-003.pdfCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Handling of Exceptional Conditions
Improper Handling of Exceptional Conditions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.