Answer in brief
CVE-2026-80155 records a Critical severity (CVSS 10.0) vulnerability in Lantronix Autonomous Out-of-Band Devices Unauthenticated Authentication Bypass via snprintf Path Truncation. The current sources do not mark it as known exploited. The current feed maps LANTRONIX/EMG7500 (generic), LANTRONIX/EMG8500 (generic), LANTRONIX/SLB882 (generic), LANTRONIX/SLC8000 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 10.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps LANTRONIX/EMG7500 (generic), LANTRONIX/EMG8500 (generic), LANTRONIX/SLB882 (generic), LANTRONIX/SLC8000 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| LANTRONIX/EMG7500generic | >=0 <9.7.0.1 | 9.7.0.1 |
| LANTRONIX/EMG8500generic | >=0 <9.7.0.1 | 9.7.0.1 |
| LANTRONIX/SLB882generic | * | Not reported |
| LANTRONIX/SLC8000generic | >=0 <9.7.0.5 | 9.7.0.5 |
| LANTRONIX/SLCx-02generic | * | Not reported |
| LANTRONIX/SLCx-03generic | * | Not reported |
Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 22, 2026
Lantronix SLC8000 before firmware v9.7.0.5, EMG8500/EMG7500 before firmware v9.7.0.1, and all firmware versions of SLB882/SLCx-03/SLCx-02 contain an authentication bypass vulnerability in the web management portal upload endpoint that allows unauthenticated attackers to read sensitive configuration files and upload files to arbitrary filesystem locations, leading to remote code execution. The web configuration server constructs the session cookie file path using snprintf with a fixed-size buffer; by supplying a cookie value of a specific length an attacker causes the path to truncate at the required delimiter and leverages path traversal to redirect authentication validation to an arbitrary on-disk file such as the local user database, bypassing all session checks. Attackers can use this vulnerability to achieve complete loss of confidentiality, integrity, and availability on the affected device and potentially impact downstream serial-connected devices.
Quoted source text, attributed separately from HOL analysis.