Security readout for executives and security teams
Plain-English summary
This is a denial-of-service flaw in AVEVA SuiteLink Server. A network attacker could trigger a crash by sending certain commands, disrupting availability of affected AVEVA industrial software environments. The sources do not show data theft, system takeover, or confirmed active exploitation.
Executive priority
Treat this as a high-priority availability risk for industrial operations using affected AVEVA products. It is not described as data theft or code execution, but service disruption in OT environments can still create material business impact.
Technical view
CVE-2021-32979 is a CWE-476 null pointer dereference in SuiteLink Server while processing commands 0x04 and 0x0a. CVSS 3.1 is 7.5, with network reachability, low complexity, no privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is most relevant where AVEVA System Platform 2020, InTouch 2020, Historian 2020, Communication Drivers Pack 2020, Batch Management 2020, or MES 2014 include a reachable SuiteLink Server. The source bundle lists versions as unspecified.
Exploitation context
The source bundle does not cite CISA KEV listing or active exploitation. The CVSS vector indicates a remotely reachable, unauthenticated denial-of-service condition, but available evidence here does not support claims of exploitation in the wild.
Researcher notes
Evidence is limited to the CVE record and AVEVA advisory reference in the bundle. Affected product versions are not specified beyond product-year labels. Do not infer broader product impact, exploit maturity, or fixed versions without the vendor bulletin details.
Mitigation direction
- Review AVEVA Security Bulletin AVEVA-2021-003 for product-specific remediation guidance.
- Prioritize vendor-supported updates or fixes for affected AVEVA deployments.
- Restrict SuiteLink Server network access to trusted operational networks only.
- Block untrusted routing paths to affected SuiteLink Server instances.
- Include affected systems in operational recovery and restart procedures.
Validation and detection
- Inventory the listed AVEVA products and confirm deployed versions.
- Identify hosts running SuiteLink Server and their network exposure.
- Check whether vendor guidance from AVEVA-2021-003 has been applied.
- Review monitoring for unexpected SuiteLink Server crashes or availability loss.
- Confirm segmentation prevents access from untrusted networks.
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-476: 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-2021-32979 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.