Security readout for executives and security teams
Plain-English summary
LB-link AC2100_AZ3 router firmware V1.0.4 reportedly accepts unsafe input that can reach an operating-system command context. A remote attacker may therefore take control of the router, steal information, alter configuration, or disrupt service. The supplied sources do not identify a vendor patch.
Executive priority
Treat confirmed V1.0.4 deployments as urgent, prioritising internet-reachable or externally accessible routers. Immediately reduce exposure while seeking authoritative vendor remediation. Because compromise could affect all three security objectives, unsupported devices without an effective fix should enter accelerated replacement planning.
Technical view
The flaw is described in bs_SetLimitCli_info within libshare.so. Insufficient input validation allows shell metacharacters in user-controlled data to enter a system-command execution context. CVSS 3.1 rates it 9.8: network-accessible, low complexity, no privileges or user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to LB-link AC2100_AZ3 devices running V1.0.4, based on the narrative evidence. Risk is greatest where an untrusted network can reach the service path invoking the vulnerable function. The supplied material does not identify the affected endpoint, default configuration, or whether WAN access is enabled.
Exploitation context
The vulnerability is not listed as CISA KEV in the supplied bundle, and no cited source establishes active exploitation. Its CVSS vector indicates remote, unauthenticated, low-complexity exploitation without user interaction, making reachable affected devices attractive targets. Public technical disclosure exists, but prevalence and operational exploitation remain unconfirmed.
Researcher notes
Product and version are explicit in the CVE narrative, although the structured affected-product fields are recorded as n/a and provide no CPE. The exact parameter, calling endpoint, firmware variants, authentication path, patch status, and exploitation telemetry are absent. Validate exposure without assuming that every service using libshare.so reaches the vulnerable function.
Mitigation direction
- Check LB-Link security guidance and firmware availability; the supplied sources do not identify a patch.
- Restrict affected routers from untrusted networks and limit management access to trusted administrative systems.
- Segment affected devices to reduce access to sensitive internal services if compromise occurs.
- Replace affected hardware if no supported remediation becomes available and exposure cannot be adequately contained.
Validation and detection
- Inventory LB-link AC2100_AZ3 devices and confirm whether firmware V1.0.4 is installed.
- Determine which reachable service paths invoke bs_SetLimitCli_info; the supplied sources do not name the endpoint.
- Review router and perimeter logs for unexpected input, configuration changes, command activity, or outbound connections.
- After remediation, confirm the vulnerable firmware is absent and network restrictions remain effective.
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
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CWE-20: 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-2026-35868 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
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.
SSVC decision data
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:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Orcust-Automaton/Vulnerability/blob/main/LB-Link/AC2100_AZ3/bs_SetLimitCli_info.mdCVE reference, mitre
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 Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.