Security readout for executives and security teams
Plain-English summary
CVE-2021-26730 is a critical flaw in Lanner IAC-AST2500A standard firmware 1.10.0. A remote unauthenticated attacker could potentially take over the affected service as root, giving full control of the management environment. Treat reachable affected devices as urgent exposure.
Executive priority
Prioritize discovery and isolation immediately. This is a critical unauthenticated network flaw with potential root impact, but the source bundle does not confirm active exploitation or provide a specific patch.
Technical view
The issue is a stack-based buffer overflow in a subfunction of Login_handler_func in spx_restservice. The CVSS 3.1 score is 10.0 with network access, low complexity, no privileges, no user interaction, scope change, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to environments running Lanner IAC-AST2500A standard firmware version 1.10.0. Risk is highest where the affected management service is reachable from untrusted networks or shared operational networks.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. However, the vulnerability is remotely reachable, unauthenticated, and can lead to root-level code execution, so exploitation potential is severe.
Researcher notes
Do not broaden scope beyond Lanner IAC-AST2500A firmware 1.10.0 without additional evidence. The key validation question is whether spx_restservice is reachable on affected firmware. The bundle supports impact and CVSS severity, not exploit-in-the-wild status.
Mitigation direction
- Identify all Lanner IAC-AST2500A devices and firmware versions.
- Check Lanner and Nozomi guidance for fixed firmware or official mitigations.
- Restrict access to affected management services from untrusted networks.
- Place vulnerable devices behind tightly controlled management network access.
- Monitor login-related service activity for suspicious failures or crashes.
Validation and detection
- Confirm whether any IAC-AST2500A device runs firmware version 1.10.0.
- Verify whether spx_restservice is enabled and network reachable.
- Review asset inventories for exposed BMC or management interfaces.
- Check vendor advisories for patch status before declaring remediation complete.
- Look for unusual rest service crashes or unexpected login activity.
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-121: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-26730 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
- Critical
- CVSS
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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:C/C:H/I:H/A:H3.96Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.