Security readout for executives and security teams
Plain-English summary
This flaw affects Lanner IAC-AST2500A BMC firmware 1.10.0. A network attacker could change access rights for KVM and Virtual Media features, which are sensitive remote management functions. Business risk is highest where these controllers are reachable from broad internal networks or the internet.
Executive priority
Treat this as a moderate-priority infrastructure risk. Prioritize internet-exposed or broadly reachable BMCs first, because compromised remote management access can disrupt operations even when the CVSS severity is not critical.
Technical view
CVE-2021-44776 is broken access control in spx_restservice, specifically SubNet_handler_func. The CVSS 3.1 score is 6.5 with network attack vector, low complexity, no privileges, and no user interaction. Reported impacts are low integrity and availability impact, with no confidentiality impact in the CVSS vector.
Likely exposure
Exposure appears limited to Lanner Inc IAC-AST2500A standard firmware version 1.10.0. Risk increases when BMC management services are reachable from untrusted networks, shared OT/IoT segments, or unmanaged remote access paths.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The issue is still operationally important because unauthenticated network access is listed in the CVSS vector and the affected functions control KVM and Virtual Media permissions.
Researcher notes
Do not assume broader AST2500 exposure beyond the named Lanner firmware unless confirmed by vendor data. Available evidence identifies broken access control in SubNet_handler_func and arbitrary changes to KVM and Virtual Media access rights, but does not provide active exploitation or patch details in the supplied bundle.
Mitigation direction
- Confirm whether Lanner has fixed firmware or mitigation guidance for IAC-AST2500A version 1.10.0.
- Restrict BMC and spx_restservice access to trusted management networks only.
- Remove internet exposure for affected BMC management interfaces.
- Review KVM and Virtual Media permissions for unexpected changes.
- Monitor BMC administrative events and configuration changes.
Validation and detection
- Inventory Lanner IAC-AST2500A devices and record firmware versions.
- Flag any device running standard firmware version 1.10.0.
- Map network reachability to BMC management services from user and external segments.
- Review configuration history for KVM and Virtual Media access-right changes.
- Check vendor and Nozomi advisory updates for patch status.
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-284: Authorization and privilege behavior lookup
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Open ATT&CK lookupCVE-2021-44776 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
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 Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.