Security readout for executives and security teams
Plain-English summary
This flaw affects EIPStackGroup OpENer EtherNet/IP versions or commits before February 10, 2021. A malicious network packet could make the software read data it should not expose. The main business risk is confidentiality leakage in industrial or embedded systems using this stack.
Executive priority
Treat this as high priority for environments running OpENer in reachable OT networks. It is confidentiality-focused, not a confirmed outage or active-exploitation case in the provided evidence, but unauthenticated network exposure raises urgency.
Technical view
CVE-2021-27482 is a CWE-125 out-of-bounds read in OpENer EtherNet/IP. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, meaning remote unauthenticated exploitation is described, with high confidentiality impact and no stated integrity or availability impact.
Likely exposure
Exposure is most likely where OpENer EtherNet/IP is embedded in industrial, automation, or test systems and reachable over a network. The bundle does not identify downstream products or specific CPEs, so asset discovery must confirm actual use.
Exploitation context
The source bundle says a specifically crafted packet may read arbitrary data. It is not listed as CISA KEV, and the provided sources do not state active exploitation, public weaponization, or ransomware use.
Researcher notes
Evidence is limited to the CVE description, CVSS data, CISA advisory reference, and upstream repository reference. No affected downstream vendors, fixed release number, exploit maturity, or packet-level details are provided in the bundle.
Mitigation direction
- Identify systems or products that include EIPStackGroup OpENer EtherNet/IP.
- Update OpENer to a commit or version dated February 10, 2021 or later, where applicable.
- Check CISA and vendor guidance before changing embedded or vendor-managed systems.
- Restrict EtherNet/IP access to trusted OT management networks only.
- Monitor for unexpected EtherNet/IP traffic from untrusted or unusual sources.
Validation and detection
- Review SBOMs, firmware notices, and source forks for OpENer usage.
- Confirm deployed OpENer code predates or postdates February 10, 2021.
- Map network paths to systems exposing EtherNet/IP services.
- Check whether affected systems are reachable from IT, vendor VPNs, or the internet.
- Record compensating controls where immediate updating is not possible.
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-125: 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-2021-27482 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:H/I:N/A:N
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:H/I:N/A:N3.93.6Primary 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:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02CVE reference · x_refsource_CONFIRM
- https://github.com/EIPStackGroup/OpENerCVE 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.