CVE-2026-80155Critical· 10.0▾ Midnight

Lantronix SLC8000 before firmware v9.7.0.5, SLC9000 before firmware v9.7.0.2, 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 managem…

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score55/ 100 · Moderate

impact 55 · likelihood 0.3 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

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Published

Sep 22, 2026

Updated

Sep 24, 2026

CVSS

10.0

Vendor

LANTRONIX

Product

SLC8000

CWE

CWE-22

Depth score

55 · Moderate

EPSS

1.6% · p74

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

decided 2026-09-22

Exploitation: none
Automatable: yes
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 2 days

Sep 22, 2026Published
Disclosed via NVD
Sep 24, 2026Record revised
Last analysed / modified upstream
Sep 24, 2026EPSS first tracked
1.6%

LANTRONIX CWE-22 #nvd #cve.org

Affected

SLC8000 < 9.7.0.5
EMG8500 < 9.7.0.1
EMG7500 < 9.7.0.1
SLB882
SLCx-03
SLCx-02

Full technical detail▾

Overview

Lantronix SLC8000 before firmware v9.7.0.5, SLC9000 before firmware v9.7.0.2, 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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org

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