Security readout for executives and security teams
Plain-English summary
Micrium OS 5.10.1 and earlier can miscalculate requested memory sizes in specific memory pool creation functions. A system may allocate a much smaller memory block than intended, causing unexpected behavior. Business urgency is moderate: the issue is remotely scored, but the provided sources do not show active exploitation or name device-specific impact.
Executive priority
Treat this as a moderate embedded-systems risk. It deserves inventory-driven follow-up, especially for industrial or remotely reachable devices, but the provided evidence does not support emergency response language.
Technical view
CVE-2021-27411 is a CWE-190 integer wraparound in Mem_DynPoolCreate, Mem_DynPoolCreateHW, and Mem_PoolCreate. The CVSS 3.1 score is 6.5 with network attack vector, no privileges, and no user interaction. The stated impacts are limited integrity and availability, with no confidentiality impact.
Likely exposure
Exposure is most likely in embedded, IoT, or industrial products that include Micrium OS 5.10.1 or earlier. The source bundle does not identify downstream device vendors or specific firmware versions, so asset inventory and vendor confirmation are required.
Exploitation context
The bundle marks CISA KEV as false and provides no evidence of active exploitation. The CVSS vector indicates potential remote attackability, but the provided sources do not describe exploit prerequisites, reachable interfaces, or public exploit maturity.
Researcher notes
Key gaps are downstream product mapping, patch status, and reachable attack paths. Analysis should focus on firmware provenance, affected Micrium OS versions, and whether memory pool creation paths can be influenced across exposed interfaces.
Mitigation direction
- Identify products and firmware that include Micrium OS 5.10.1 or earlier.
- Check Silicon Labs, Micrium, and device-vendor guidance for fixed versions or mitigations.
- Prioritize updates for network-reachable embedded or industrial devices.
- Reduce unnecessary network exposure to affected devices while awaiting vendor guidance.
- Document compensating controls where firmware updates are unavailable.
Validation and detection
- Review SBOMs, firmware notes, or vendor attestations for Micrium OS usage.
- Confirm whether affected functions are present in the shipped firmware codebase.
- Map exposed network services on devices that may embed Micrium OS.
- Verify vendor advisory status and remediation availability for each affected product.
- Retest firmware version and exposure after applying vendor updates.
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-190: 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-2021-27411 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
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:L/A:L3.92.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04CVE reference · x_refsource_CONFIRM
- https://www.silabs.com/developers/micrium-osCVE 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.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.