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CVE-2019-6109: An issue was discovered in OpenSSH 7.9

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MEDIUM 6.8WATCHLISTUPGRADEUPGRADEMITIGATE

CVE-2019-6109 is a medium-severity flaw (CVSS 6.8) affecting openssh, winscp, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affects refresh_progress_meter() in progressmeter.c.

Why this priority

  • EPSS top 10%: very likely to be exploited
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score6.8 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionRequired
EPSS exploit chance3.8% (top 10%)
CISA exploited listNo
WeaknessCWE-116
Published2019-01-31
Last modified2026-10-14
Publisher (CNA): MITRE · Vendor: canonical · debian · netapp · openbsd · winscp

Share: LinkedIn · X · Reddit

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openbsd openssh UPGRADE
Affected: <= 7.9
Fixed in: newer than 7.9
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy openssh || rpm -q openssh || openssh --version
2. UPGRADE to newer than 7.9 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openssh
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openssh
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
winscp winscp UPGRADE
Affected: <= 5.13
Fixed in: newer than 5.13
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy winscp || rpm -q winscp || winscp --version
2. UPGRADE to newer than 5.13 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade winscp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade winscp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
canonical ubuntu linux MITIGATE
Affected: 14.04 · 16.04 · 18.04 · 18.10
Fixed in: no fixed release known
Safe to downgrade to: a release before 14.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
debian debian linux MITIGATE
Affected: 8.0 · 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
netapp element software MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy element-software || rpm -q element-software || element-software --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp ontap select deploy MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy ontap-select-deploy || rpm -q ontap-select-deploy || ontap-select-deploy --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-6109?

openssh: upgrade to newer than 7.9; winscp: upgrade to newer than 5.13; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-6109 being exploited?

CVE-2019-6109 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-6109 affect?

CVE-2019-6109 affects openssh, winscp, ubuntu linux. Severity is medium (CVSS 6.8). An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI contr

How urgent is CVE-2019-6109?

Priority 51/100. EPSS top 10%: very likely to be exploited; On your watchlist

Software pages

OpenSSH vulnerabilities · Ubuntu vulnerabilities · Debian vulnerabilities

Related CVEs

References

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