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.
CVE-2026-80155
“—” beside the score: it is equal to the CVSS score beside it.
Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-22. A secondary CVSS source baseline 10.0; sources differ by 0.0.
Also known asEUVD-2026-84521 (ENISA EUVD) · GHSA-h7c7-c453-99x2 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).
- CVSS v3
- 10.0
- EG Score
- 10.0CRITICALmedium confidence
- EG Risk
- 60EG Risk 60/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity100% × 45%Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation1.0% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high. - EPSS PROB
- 1.0%
- EPSS %ILE
- 63rd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.
- EG Severity
- 10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 1.0% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 22, 2026
Last Modified
September 24, 2026
Advisory Details (6)
Auto-updated Oct 30, 2026Lantronix Autonomous Out-of-Band Devices Unauthenticated Authentication Bypass via snprintf Path Truncation | Advisories | VulnCheck
https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-unauthenticated-authentication-bypass-via-snprintf-path-truncationts.lantronix.com - /ftp/emg/EMG_8500/9.7.0.1R2/
https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/ts.lantronix.com - /ftp/emg/EMG_7500/9.7.0.1R2/
https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/REVRB-LANTERN: Security Research on Lantronix Autonomous Out-of-Band Devices | RE/VRb LLC
https://revrb.net/2026/09/21/revrb-lantern.htmlVendor Advisories for CVE-2026-80155(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 23× in last 7d / 134× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 219 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 119 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 19:40 UTCEG score recompute
- 2026-11-01 19:39 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-31 21:54 UTCEG score recompute
- 2026-10-31 21:53 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-31 00:07 UTCEG score recompute
- 2026-10-31 00:07 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-30 02:21 UTCEG score recompute
- 2026-10-30 02:21 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-29 04:36 UTCEG score recompute
- 2026-10-29 04:36 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-28 06:40 UTCEG score recompute
- 2026-10-28 06:40 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-27 08:54 UTCEG score recompute
- 2026-10-27 08:54 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-26 09:40 UTCEG score recompute
- 2026-10-26 09:40 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-25 13:59 UTCEG score recompute
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- 2026-10-25 11:55 UTCEG score recompute
- 2026-10-25 11:55 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-24 14:09 UTCEG score recompute
- 2026-10-24 14:09 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-23 16:23 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-22 18:36 UTCEG score recompute
- 2026-10-22 18:36 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-21 22:05 UTCEG score recompute
- 2026-10-21 22:05 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-21 00:08 UTCEG score recompute
- 2026-10-21 00:07 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-20 02:19 UTCEG score recompute
- 2026-10-20 02:18 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-19 01:40 UTCEG score recompute
- 2026-10-19 01:39 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-18 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-18 03:52 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-18 03:10 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-17 06:04 UTCEG score recompute
- 2026-10-17 06:04 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-16 16:44 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-16 07:11 UTCEG score recompute
- 2026-10-16 07:10 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-15 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-15 05:58 UTCEG score recompute
- 2026-10-15 05:58 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-14 01:37 UTCEG score recompute
- 2026-10-14 01:36 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-12 21:47 UTCEG score recompute
- 2026-10-12 21:47 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-12 16:35 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-12 14:57 UTCEG score recompute
- 2026-10-12 01:40 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-11 19:15 UTCEG score recompute
- 2026-10-11 19:15 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-11 16:37 UTCEG score recompute
- 2026-10-11 14:51 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-11 13:56 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-11 10:28 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-11 06:05 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-11 01:42 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-10 20:07 UTCEG score recompute
- 2026-10-10 20:06 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-10 15:43 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-10 11:20 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-10 06:57 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-10 02:34 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-09 22:11 UTCEG score recompute
- 2026-10-09 22:11 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-09 17:48 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-09 12:48 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-09 06:30 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-09 02:06 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-08 21:44 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-08 17:14 UTCEG score recompute
- 2026-10-08 17:14 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-08 12:00 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-08 07:00 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-08 02:37 UTCEG score recompute
- 2026-10-08 02:37 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-07 22:14 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
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Frequently asked(5)
What is CVE-2026-80155?
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Dependency Blast Radius
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