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CVE-2018-1000805: Paramiko Authentication Bypass Vulnerability

paramiko Updated 02 Oct 2025

Summary

10/10/2018
CVE-2018-1000805
Yes i
High
8.8

CVE-2018-1000805: Paramiko Authentication Bypass vulnerability. Affects paramiko across 5 version ranges.

>= 1.5.1, < 2.0.9 >= 2.1.0, < 2.1.6 >= 2.2.0, < 2.2.4 >= 2.3.0, < 2.3.3 >= 2.4.0, < 2.4.2

Fixed in 5 releases; the minimum fixed version depends on the release line you run. How to fix ↓

Also tracked for

The same CVE-2018-1000805 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.

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Background

Paramiko is a Python implementation of the SSHv2 protocol, providing both client and server functionality. It is widely used for secure remote connections and file transfers. The vulnerability in Paramiko versions 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, and 1.17.6 allows for an incorrect access control issue in the SSH server, potentially leading to remote code execution. This vulnerability can be exploited through network connectivity.

Vulnerability Detail

The Paramiko Authentication Bypass vulnerability (CVE-2018-1000805) arises from an incorrect access control issue in the SSH server implementation. Attackers can exploit this vulnerability remotely, potentially leading to remote code execution. The vulnerability affects Paramiko versions 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, and 1.17.6. The severity of this vulnerability is rated as HIGH with a CVSS score of 8.8.

How To Fix

Fixed versions by release line

The minimum fixed version depends on the release line you run.

  • >= 1.5.1, < 2.0.9 2.0.9 
    pip install --upgrade "paramiko==2.0.9"
  • >= 2.1.0, < 2.1.6 2.1.6 
    pip install --upgrade "paramiko==2.1.6"
  • >= 2.2.0, < 2.2.4 2.2.4 
    pip install --upgrade "paramiko==2.2.4"
  • >= 2.3.0, < 2.3.3 2.3.3 
    pip install --upgrade "paramiko==2.3.3"
  • >= 2.4.0, < 2.4.2 2.4.2 
    pip install --upgrade "paramiko==2.4.2"

Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →

Workaround

There is no known workaround for this vulnerability. It is recommended to upgrade to the fixed versions of Paramiko as mentioned in the 'how_to_fix' section.

Conclusion

The Paramiko Authentication Bypass vulnerability (CVE-2018-1000805) is a high-severity vulnerability that allows for an incorrect access control issue in the SSH server, potentially leading to remote code execution. It is crucial to upgrade Paramiko to the fixed versions mentioned in the 'how_to_fix' section to mitigate this vulnerability. For further support on vulnerability remediation, contact DevNack.com.

See every vulnerability recorded for paramiko →

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FAQ

What is Paramiko?

Paramiko is a Python implementation of the SSHv2 protocol, providing secure remote connections and file transfers.

The vulnerability allows for an incorrect access control issue in the SSH server, potentially leading to remote code execution.

This vulnerability can be exploited remotely through network connectivity.

The severity of this vulnerability is rated as HIGH with a CVSS score of 8.8.

To fix this vulnerability, upgrade Paramiko to the recommended fixed versions mentioned in the 'how_to_fix' section.

References

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Related vulnerabilities

Recent vulnerabilities recorded for paramiko.

View all paramiko vulnerabilities →
Sponsored Devnack Your last release was probably never penetration tested Manual testing by engineers who build software, not an auditor's checklist. Trusted by teams at Swift and Google Talk to Devnack

How To Fix

Fixed versions by release line

The minimum fixed version depends on the release line you run.

  • >= 1.5.1, < 2.0.9 2.0.9 
    pip install --upgrade "paramiko==2.0.9"
  • >= 2.1.0, < 2.1.6 2.1.6 
    pip install --upgrade "paramiko==2.1.6"
  • >= 2.2.0, < 2.2.4 2.2.4 
    pip install --upgrade "paramiko==2.2.4"
  • >= 2.3.0, < 2.3.3 2.3.3 
    pip install --upgrade "paramiko==2.3.3"
  • >= 2.4.0, < 2.4.2 2.4.2 
    pip install --upgrade "paramiko==2.4.2"

Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →

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