Lantronix SLC8000 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.
CVE-2026-80147
CRITICALPre-NVD 9.99.9
EchelonGraph scoreLOW confidence
This critical-severity CVE scores 9.9 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: cna:vulncheck
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.9Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.9
- EG Score
- 9.9(low)
- EG Risk
- 49(Track)EG Risk 49/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity99% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
September 22, 2026
Last Modified
September 22, 2026
Advisory Details (5)
Auto-updated Sep 22, 2026No patch confirmed yet.
generic
Lantronix Autonomous Out-of-Band Devices Stack-Based Buffer Overflow via mfc eeprom write | Advisories | VulnCheck
https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-stack-based-buffer-overflow-via-mfc-eeprom-writegeneric
ts.lantronix.com - /ftp/emg/EMG_7500/9.7.0.1R2/
https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/generic
ts.lantronix.com - /ftp/emg/EMG_8500/9.7.0.1R2/
https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/generic
REVRB-LANTERN: Security Research on Lantronix Autonomous Out-of-Band Devices | RE/VRb LLC
https://revrb.net/2026/09/21/revrb-lantern.htmlWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-22 15:30 UTCEG score recompute
- 2026-09-22 15:29 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-121
Frequently asked(4)
What is CVE-2026-80147?
CVE-2026-80147 is a critical vulnerability published on September 22, 2026. Lantronix SLC8000 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…
When was CVE-2026-80147 disclosed?
CVE-2026-80147 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-80147?
CVE-2026-80147 has a CVSS v4.0 base score of 9.9 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-80147?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80147, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-80147
Is Your Infrastructure Affected by CVE-2026-80147?
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