CVE-2018-1000805: Paramiko version 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, 1.17.6 contains a Incorrect Access Control vulnera

This month

HIGH 8.8WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2018-1000805 is a high-severity flaw (CVSS 8.8) affecting paramiko, ansible tower, virtualization host. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Paramiko version 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, 1.17.6 contains a Incorrect Access Control vulnerability in SSH server that can result in RCE. This attack appear to be exploitable via network connectivity.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Weakness	CWE-863
Published	2018-10-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: paramiko · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-10-08 15:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

paramiko paramiko DOWNGRADE

Affected: 1.17.6 · 1.18.5 · 2.0.8 · 2.1.5 · 2.2.3 · 2.3.2 · 2.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.17.6

1. Check installed version

apt-cache policy paramiko || rpm -q paramiko || paramiko --version

2. No fixed release: DOWNGRADE to a release before 1.17.6 (Debian / Ubuntu)

apt-cache madison paramiko sudo apt install paramiko=<VERSION_BEFORE_1.17.6> sudo apt-mark hold paramiko

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list paramiko sudo dnf downgrade paramiko-<VERSION_BEFORE_1.17.6> sudo dnf versionlock add paramiko

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat ansible tower DOWNGRADE

Affected: 3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3

1. Check installed version

apt-cache policy ansible-tower || rpm -q ansible-tower || ansible-tower --version

2. No fixed release: DOWNGRADE to a release before 3.3 (Debian / Ubuntu)

apt-cache madison ansible-tower sudo apt install ansible-tower=<VERSION_BEFORE_3.3> sudo apt-mark hold ansible-tower

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ansible-tower sudo dnf downgrade ansible-tower-<VERSION_BEFORE_3.3> sudo dnf versionlock add ansible-tower

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat virtualization host DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy virtualization-host || rpm -q virtualization-host || virtualization-host --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison virtualization-host sudo apt install virtualization-host=<VERSION_BEFORE_4.0> sudo apt-mark hold virtualization-host

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list virtualization-host sudo dnf downgrade virtualization-host-<VERSION_BEFORE_4.0> sudo dnf versionlock add virtualization-host

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat enterprise linux desktop MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

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.

redhat enterprise linux server MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

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.

redhat enterprise linux server aus MITIGATE

Affected: 6.4 · 6.5 · 6.6 · 7.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.4

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.

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-2018-1000805?

paramiko: downgrade or apply the listed mitigation; ansible tower: downgrade or apply the listed mitigation; virtualization host: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-1000805 being exploited?

CVE-2018-1000805 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-2018-1000805 affect?

CVE-2018-1000805 affects paramiko, ansible tower, virtualization host. Severity is high (CVSS 8.8). Paramiko version 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, 1.17.6 contains a Incorrect Access Control vulnerability in SSH server that can result in RCE. This attack appear to be exploitable via network connectivity.

How urgent is CVE-2018-1000805?

Priority 59/100. High severity; EPSS top 9%: very likely to be exploited; On your watchlist

Software pages

Ansible vulnerabilities

Related CVEs

CVE-2022-24302 MEDIUM 5.9 UPGRADE MITIGATE In Paramiko before 2.10.1, a race condition (between creation and chmod) in the write_private_key_file functio
CVE-2018-7750 CRITICAL 9.8 UPGRADE DOWNGRADE transport.py in the SSH server implementation of Paramiko before 1.17.6, 1.18.x before 1.18.5, 2.0.x before 2.

References

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