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CVE-2018-7750· NVD / CVE Program· CNA mitre

transport.py in the SSH server implementation of Paramiko before 1.17.6, 1.18.x before 1.18.5, 2.0.x before 2.0.8, 2.1.x before 2.1.5, 2.2.x

transport.py in the SSH server implementation of Paramiko before 1.17.6, 1.18.x before 1.18.5, 2.0.x before 2.0.8, 2.1.x before 2.1.5, 2.2.x before 2.2.3, 2.3.x before 2.3.2, and 2.4.x before 2.4.1 does not properly check whether authentication is completed before processing other requests, as demonstrated by channel-open. A customized SSH client can simply skip the authentication step.

CriticalCVSS 9.8 · v3.1—Proof of concept Fix available
Published
Mar 13, 2018
Updated
Jun 16, 2026
EPSS
27.1% · 98th percentile
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Report tools

JSON

Action score

47

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
8 / 30 · 27.1%

Affected systems

VendorProduct
paramikoparamiko
redhatansible engine
redhatcloudforms
redhatvirtualization
redhatenterprise linux desktop
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux server tus
redhatenterprise linux workstation
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux8.0
  • debian debian linux9.0
  • paramiko paramikobefore 1.17.6
  • paramiko paramiko1.18.0 and later · before 1.18.5
  • paramiko paramiko2.0.0 and later · before 2.0.8
  • paramiko paramiko2.1.0 and later · before 2.1.5
  • paramiko paramiko2.2.0 and later · before 2.2.3
  • paramiko paramiko2.3.0 and later · before 2.3.2
  • paramiko paramiko2.4.0
  • redhat ansible engine2.0
  • redhat ansible engine2.4
  • redhat cloudforms4.5
  • redhat cloudforms4.6
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux server6.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux server aus6.4
  • redhat enterprise linux server aus6.5
  • redhat enterprise linux server aus6.6
  • redhat enterprise linux server eus6.7

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.11py3-paramikobefore 2.4.1-r02.4.1-r0
Debian:12paramikobefore 2.4.2-0.12.4.2-0.1
Debian:8paramikobefore 1.15.1-1+deb8u11.15.1-1+deb8u1
Debian:9paramikobefore 2.0.0-1+deb9u12.0.0-1+deb9u1
openSUSE:Tumbleweedpython-paramikobefore 2.7.2-3.72.7.2-3.7
openSUSE:Tumbleweedpython-paramikobefore 5.0.0-1.15.0.0-1.1
PyPIparamikofrom 1.18.0 · before 1.18.51.18.5
PyPIparamikofrom 2.0.0 · before 2.0.82.0.8
PyPIparamikofrom 2.1.0 · before 2.1.52.1.5
PyPIparamikofrom 2.2.0 · before 2.2.32.2.3
PyPIparamikofrom 2.3.0 · before 2.3.22.3.2
PyPIparamikofrom 2.4.0 · before 2.4.12.4.1
PyPIparamikobefore 1.17.61.17.6
Red Hat:cloudforms_managementengine:5.8::el7ansible-tower-serverbefore 0:3.1.7-1.el7at0:3.1.7-1.el7at
Red Hat:cloudforms_managementengine:5.8::el7ansible-tower-setupbefore 0:3.1.7-1.el7at0:3.1.7-1.el7at
Red Hat:cloudforms_managementengine:5.8::el7cfmebefore 0:5.8.4.5-1.el7cf0:5.8.4.5-1.el7cf
Red Hat:cloudforms_managementengine:5.8::el7cfme-appliancebefore 0:5.8.4.5-1.el7cf0:5.8.4.5-1.el7cf
Red Hat:cloudforms_managementengine:5.8::el7cfme-appliance-debuginfobefore 0:5.8.4.5-1.el7cf0:5.8.4.5-1.el7cf
Red Hat:cloudforms_managementengine:5.8::el7cfme-debuginfobefore 0:5.8.4.5-1.el7cf0:5.8.4.5-1.el7cf
Red Hat:cloudforms_managementengine:5.8::el7cfme-gemsetbefore 0:5.8.4.5-1.el7cf0:5.8.4.5-1.el7cf
Red Hat:cloudforms_managementengine:5.9::el7ansiblebefore 0:2.4.4.0-1.el7ae0:2.4.4.0-1.el7ae
Red Hat:cloudforms_managementengine:5.9::el7ansible-docbefore 0:2.4.4.0-1.el7ae0:2.4.4.0-1.el7ae
Red Hat:cloudforms_managementengine:5.9::el7ansible-towerbefore 0:3.2.4-1.el7at0:3.2.4-1.el7at
Red Hat:cloudforms_managementengine:5.9::el7ansible-tower-serverbefore 0:3.2.4-1.el7at0:3.2.4-1.el7at

+44

Same product

paramiko: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-1000805Paramiko 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
    36Monitor
  • CVE-2022-24302In Paramiko before 2.10.1, a race condition (between creation and chmod) in the write_private_key_file function could allow unauthorized inf
    24Monitor
  • CVE-2026-44405In Paramiko through 4.0.0 before a448945, rsakey.py allows the SHA-1 algorithm.
    13Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:py3-paramiko2.4.1-r0 · Alpine:v3.11Package registry (OSV)
debian:paramiko2.4.2-0.1 · Debian:12Package registry (OSV)
opensuse:python-paramiko2.7.2-3.7 · openSUSE:TumbleweedPackage registry (OSV)
PyPI:paramiko1.17.6Package registry (OSV)
PyPI:paramiko1.18.5Package registry (OSV)
PyPI:paramiko2.0.8Package registry (OSV)
PyPI:paramiko2.1.5Package registry (OSV)
PyPI:paramiko2.2.3Package registry (OSV)
PyPI:paramiko2.3.2Package registry (OSV)
PyPI:paramiko2.4.1Package registry (OSV)
red hat:ansible0:2.4.4.0-1.el7ae · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:ansible-doc0:2.4.4.0-1.el7ae · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:ansible-tower0:3.2.4-1.el7at · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:ansible-tower-server0:3.2.4-1.el7at · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:ansible-tower-setup0:3.2.4-1.el7at · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:ansible-tower-ui0:3.2.4-1.el7at · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:ansible-tower-venv-ansible0:3.2.4-1.el7at · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:ansible-tower-venv-tower0:3.2.4-1.el7at · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:cfme0:5.9.2.4-1.el7cf · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:cfme-amazon-smartstate0:5.9.2.4-1.el7cf · Red Hat:cloudforms_managementengine:5.9::el7Package registry (OSV)
red hat:python-paramiko0:2.1.1-4.el7 · Red Hat:rhel_extras_other:7Package registry (OSV)
red hat:python-paramiko-doc0:2.1.1-4.el7 · Red Hat:rhel_extras_other:7Package registry (OSV)
suse:python-paramiko2.0.8-3.3.1 · SUSE:OpenStack Cloud 7Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1
  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entryremote2018-10-29
Proof-of-concept repository on GitHubstars:212018-11-06
Proof-of-concept repository on GitHubstars:02024-12-13

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+229 d
  3. TodaySep 30, 2026+3123 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records