CVE-2026-80155

CRITICALPre-NVD 10.010.0
EchelonGraph scoreMEDIUM confidence

“—” 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.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-84521 (ENISA EUVD) · GHSA-h7c7-c453-99x2 (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan mitigationNo release containing the referenced fix 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 (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 10.0Exploit: None knownExposed services: Not assessed

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).

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.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
60
EG 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, 2026
Fix referenced — no release confirmed yet.
Web page

Lantronix 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-truncation
Web page

ts.lantronix.com - /ftp/slc8000/9.7.0.5R2/

https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/
Web page

ts.lantronix.com - /ftp/emg/EMG_8500/9.7.0.1R2/

https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/
Web page

ts.lantronix.com - /ftp/emg/EMG_7500/9.7.0.1R2/

https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/
Web page

ts.lantronix.com - /ftp/SLC9000/9.7.0.2R1/

https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/
Web page

REVRB-LANTERN: Security Research on Lantronix Autonomous Out-of-Band Devices | RE/VRb LLC

https://revrb.net/2026/09/21/revrb-lantern.html

Vendor 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.

  1. 2026-11-01 19:40 UTCEG score recompute
  2. 2026-11-01 19:39 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-11-01 16:35 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  4. 2026-10-31 21:54 UTCEG score recompute
  5. 2026-10-31 21:53 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-10-31 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  7. 2026-10-31 00:07 UTCEG score recompute
  8. 2026-10-31 00:07 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-10-30 16:35 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  10. 2026-10-30 02:21 UTCEG score recompute
  11. 2026-10-30 02:21 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  12. 2026-10-29 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  13. 2026-10-29 04:36 UTCEG score recompute
  14. 2026-10-29 04:36 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  15. 2026-10-28 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  16. 2026-10-28 06:40 UTCEG score recompute
  17. 2026-10-28 06:40 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  18. 2026-10-27 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  19. 2026-10-27 08:54 UTCEG score recompute
  20. 2026-10-27 08:54 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  21. 2026-10-26 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  22. 2026-10-26 09:40 UTCEG score recompute
  23. 2026-10-26 09:40 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  24. 2026-10-25 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  25. 2026-10-25 13:59 UTCEG score recompute
Show 75 more
  1. 2026-10-25 11:55 UTCEG score recompute
  2. 2026-10-25 11:55 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-10-24 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  4. 2026-10-24 14:09 UTCEG score recompute
  5. 2026-10-24 14:09 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-10-23 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  7. 2026-10-23 16:23 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  8. 2026-10-22 18:36 UTCEG score recompute
  9. 2026-10-22 18:36 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  10. 2026-10-22 16:35 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  11. 2026-10-21 22:05 UTCEG score recompute
  12. 2026-10-21 22:05 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  13. 2026-10-21 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  14. 2026-10-21 00:08 UTCEG score recompute
  15. 2026-10-21 00:07 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  17. 2026-10-20 02:19 UTCEG score recompute
  18. 2026-10-20 02:18 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  19. 2026-10-19 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  20. 2026-10-19 01:40 UTCEG score recompute
  21. 2026-10-19 01:39 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  22. 2026-10-18 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  23. 2026-10-18 03:52 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  24. 2026-10-18 03:10 UTCEG score recompute
  25. 2026-10-17 16:35 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  26. 2026-10-17 06:04 UTCEG score recompute
  27. 2026-10-17 06:04 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  28. 2026-10-16 16:44 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  29. 2026-10-16 07:11 UTCEG score recompute
  30. 2026-10-16 07:10 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  31. 2026-10-15 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  32. 2026-10-15 05:58 UTCEG score recompute
  33. 2026-10-15 05:58 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  34. 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  35. 2026-10-14 01:37 UTCEG score recompute
  36. 2026-10-14 01:36 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  37. 2026-10-13 16:35 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  38. 2026-10-12 21:47 UTCEG score recompute
  39. 2026-10-12 21:47 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  40. 2026-10-12 16:35 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  41. 2026-10-12 14:57 UTCEG score recompute
  42. 2026-10-12 01:40 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  43. 2026-10-11 19:15 UTCEG score recompute
  44. 2026-10-11 19:15 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  45. 2026-10-11 16:37 UTCEG score recompute
  46. 2026-10-11 14:51 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  47. 2026-10-11 13:56 UTCEG score recompute
  48. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  49. 2026-10-11 10:28 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  50. 2026-10-11 06:05 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  51. 2026-10-11 01:42 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  52. 2026-10-10 20:07 UTCEG score recompute
  53. 2026-10-10 20:06 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  54. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  55. 2026-10-10 15:43 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  56. 2026-10-10 11:20 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  57. 2026-10-10 06:57 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  58. 2026-10-10 02:34 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  59. 2026-10-09 22:11 UTCEG score recompute
  60. 2026-10-09 22:11 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  61. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  62. 2026-10-09 17:48 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  63. 2026-10-09 12:48 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  64. 2026-10-09 06:30 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  65. 2026-10-09 02:06 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  66. 2026-10-08 21:44 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  67. 2026-10-08 17:14 UTCEG score recompute
  68. 2026-10-08 17:14 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  69. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  70. 2026-10-08 12:00 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  71. 2026-10-08 07:00 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  72. 2026-10-08 02:37 UTCEG score recompute
  73. 2026-10-08 02:37 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0
  74. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  75. 2026-10-07 22:14 UTCGHSA enrichmentGHSA-h7c7-c453-99x2 · GitHub severity CRITICAL · GitHub CVSS 10.0

Frequently asked(5)

What is CVE-2026-80155?
CVE-2026-80155 is a critical-severity vulnerability; its CVE record was published on September 22, 2026. 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…
When was CVE-2026-80155 made public?
CVE-2026-80155 was made public on September 18, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 22, 2026. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-80155 actively exploited?
CVE-2026-80155 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (63rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-80155?
CVE-2026-80155 has a CVSS base score of 10.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-80155?
A fix for CVE-2026-80155 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-80155 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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