SLC8000: Stack-based Buffer Overflow
CVE-2026-80147 is a critical-severity stack-based buffer overflow vulnerability in SLC8000 from Lantronix, with a CVSS 3.1 base score of 9.9 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 9.7.0.2 as the first without the flaw, so updating SLC8000 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.46% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update SLC8000 to 9.7.0.2 or a later version.
- Update EMG8500 to 9.7.0.1 or a later version.
- Update EMG7500 to 9.7.0.1 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| LANTRONIX | SLC8000 | before 9.7.0.2 | 9.7.0.2 |
| LANTRONIX | EMG8500 | before 9.7.0.1 | 9.7.0.1 |
| LANTRONIX | EMG7500 | before 9.7.0.1 | 9.7.0.1 |
| LANTRONIX | SLB882 | Not specified in the record | Not stated |
| LANTRONIX | SLCx-03 | Not specified in the record | Not stated |
| LANTRONIX | SLCx-02 | Not specified in the record | Not stated |
| LANTRONIX | SLC9000 | before 9.7.0.2 | 9.7.0.2 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. Scored by CNA (vulncheck.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 9.4 | Critical | CNA (vulncheck.com) |
| CVSS 3.1 | 9.9 | Critical | CNA (vulncheck.com) |
Official description
Lantronix SLC8000/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 a stack-based buffer overflow vulnerability that allows authenticated attackers to potentially execute arbitrary code by exploiting an undocumented mfc eeprom write command that copies unbounded user input into a bounded stack buffer before passing it to a system() call. Attackers can authenticate as any user to the terminal or CLI interface and supply an oversized input to trigger the overflow, potentially achieving complete loss of confidentiality, integrity, and availability on the affected device and impacting downstream serial-attached devices.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Stack-based Buffer Overflow
The product writes past the end of a buffer that was allocated on the stack.
How developers prevent this class of flaw
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
- Use an abstraction library to abstract away risky APIs. Not a complete solution.
- Implement and perform bounds checking on input.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
- revrb.net/2026/09/21/revrb-lantern.html
- ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/
- ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/
- ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/
- ts.lantronix.com/ftp/slc8000/9.7.0.2R1/
- vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-stack-based-buffer-overflow-via-mfc-eeprom-…
Other vulnerabilities in SLC8000
- 9.1 Critical severity
- 10.0 Critical severity
- 9.6 Critical severity
- 9.1 Critical severity
- 9.1 Critical severity
- 7.5 High severity
Recent Stack-based Buffer Overflow vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 8.6 High severity
- 10.0 Critical severity
- 9.9 Critical severity
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