Security readout for executives and security teams
Plain-English summary
This ABB relay vulnerability can let a local actor manipulate communication channel behavior in affected Distribution Automation products, potentially causing loss of availability. The supplied evidence does not show data theft or remote internet exploitation. Because these devices support power operations, affected asset owners should verify firmware versions and update through ABB guidance.
Executive priority
Prioritize during OT maintenance planning, especially for substations or facilities where relay availability is safety or service critical. This is not evidenced as internet-scale exploitation, but operational impact can be material if affected devices are reachable by unauthorized local users.
Technical view
CVE-2021-22283 is CWE-665 improper initialization affecting ABB Relion 611/615/620/REX640/RER615, REC615, and SMU615 firmware ranges. CVSS 3.1 is 6.2: local attack vector, low complexity, no privileges, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Likely exposure
Exposure is concentrated in operational technology environments using the listed ABB relay, remote monitoring, or merging unit firmware versions. The CVSS vector is local, so risk depends heavily on physical, maintenance, engineering workstation, and substation network access controls.
Exploitation context
The source bundle does not cite active exploitation, and the CVE is not marked KEV. The vulnerability is not described as remotely exploitable in the provided CVSS vector. Treat it as an availability risk for exposed or poorly segmented operational environments.
Researcher notes
The evidence is specific on affected ABB product families, version ranges, CVSS vector, CWE, and availability impact. It does not provide exploit details or proof of exploitation. Validate exposure through firmware comparison and environment access review rather than assuming broad remote reachability.
Mitigation direction
- Inventory ABB Relion, REC615, and SMU615 devices and record firmware versions.
- Upgrade affected firmware to the fixed version or later listed for each product line.
- Review ABB advisory 2NGA001147 for product-specific remediation instructions.
- Restrict local and maintenance access to relay communication interfaces.
- Strengthen OT segmentation and access control around engineering workstations and substations.
Validation and detection
- Compare installed firmware against the affected ranges and fixed versions in the CVE record.
- Confirm each relevant ABB product line is accounted for in the asset inventory.
- Verify upgrade status after maintenance windows using approved asset-management procedures.
- Check whether local maintenance pathways are limited to authorized personnel and systems.
- Document compensating controls where firmware cannot be updated promptly.
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-665: 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-2021-22283 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
- Medium
- CVSS
- 6.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/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:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
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 Initialization
Improper Initialization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.