Public proof of conceptFix available

CVE-2018-10933

Q: Is CVE-2018-10933 actively exploited?

Active exploitation of CVE-2018-10933 has not been confirmed. Its EPSS score was 91.8% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-10933?

CVE-2018-10933 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

A public proof of concept exists; no exploitation attested.

Published2018-10-17
Fixed in0.8.4 · 0.7.6
WeaknessCWE-287 · CWE-592

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability was found in libssh's server-side state machine before versions 0.7.6 and 0.8.4. A malicious client could create channels without first performing authentication, resulting in unauthorized access.

Timeline

dates in UTC

2018-10-1712:29CVE publishedNVD
2018-10-18Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-10933?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-10933?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Libssh

Branch	Affected	Fixed in	Source
0.8	≥ 0.8.0, < 0.8.4	0.8.4	NVD
0.x	≥ 0.6.0, < 0.7.6	0.7.6	NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
14.4	= 14.04	no fix published	NVD
16.4	= 16.04	no fix published	NVD
18.4	= 18.04	no fix published	NVD
18.10	= 18.10	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
8.0	= 8.0	no fix published	NVD
9.0	= 9.0	no fix published	NVD

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

cockpitRed Hat:rhel_extras_other:7all versions · fixed in 0:176-4.el7and 6 other packages
libsshUbuntu:18.04:LTSall versions · fixed in 0.8.0~20170825.94fa1e38-1ubuntu0.1
libsshUbuntu:16.04:LTSall versions · fixed in 0.6.3-4.3ubuntu0.1
libsshUbuntu:14.04:LTSall versions · fixed in 0.6.1-0ubuntu3.4
libsshSUSE:Linux Enterprise Workstation Extension 12 SP3all versions · fixed in 0.6.3-12.6.1
libsshSUSE:Linux Enterprise Software Development Kit 12 SP3all versions · fixed in 0.6.3-12.6.1
libsshSUSE:Linux Enterprise Module for Basesystem 15all versions · fixed in 0.7.5-6.3.1
libsshSUSE:Linux Enterprise Desktop 12 SP3all versions · fixed in 0.6.3-12.6.1

29 more package ranges on OSV.dev

Vendor advisories

CVE-2018-10933 Red Hat Product Security35 products fixed
libssh: Authentication Bypass due to improper message callbacks implementation
ICSA-21-007-01 CISA2 known affected
Hitachi ABB Power Grids FOX615 Multiservice-Multiplexer
FOX61x R2 using CESM1/CESM2: All versions prior to cesne_r2d14_03.esw · FOX61x R1 using CESM1/CESM2: All versions prior to cesne_r1h07_12.esw
ICSA-20-294-02 CISA2 known affected
Hitachi ABB Power Grids XMC20 Multiservice-Multiplexer
XMC20 R6 using COGE5: versions older than co5ne_r2d14_03.esw · XMC20 R4 using COGE5: versions older than co5ne_r1h07_12.esw
RHBA-2018:3712 Red Hat Product Security35 products fixed
Red Hat Bug Fix Advisory: cockpit bug fix update

Full record on NVD

Fix

Update Libssh to 0.8.4 · 0.7.6
Vendor fix Red Hat Product Security RHBA-2018:3712 · 53 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Mitigation from the vendor CISA ICSA-21-007-01 · 2 productsHitachi ABB Power Grids recommends users apply the following firmware: FOX61x R1: CESM1/CESM2: Update to Version cesne_r1h07_12.esw or newer
Mitigation from the vendor CISA ICSA-21-007-01 · 2 productsHitachi ABB Power Grids recommends users apply the following firmware: FOX61x R2: CESM1/CESM2: Update to Version cesne_r2d14_03.esw or newer
Mitigation from the vendor CISA ICSA-21-007-01 · 2 productsFor additional information and support please contact a product provider or Hitachi ABB Power Grids service organization.
Mitigation from the vendor CISA ICSA-21-007-01 · 2 productsHitachi ABB Power Grids recommends security practices and firewall configurations to help protect a process control network from attacks originating from outside the network. Such practices require process control systems be physically protected from direct access by unauthorized personnel, have no…
Mitigation from the vendor CISA ICSA-20-294-02 · 2 productsHitachi ABB Power Grids has corrected the problem in the following product versions and recommends users apply the firmware update at the earliest availability

Advisories and patches

www.libssh.orgVendor Advisory
www.oracle.comPatch

Detection

read 2026-11-02 22:42 UTC

Nuclei template: none so far
Exploit-DB: EDB-45638 EDB-46307
Proof-of-concept repositories: 20 repositories, unverifiedSoledaD208/CVE-2018-10933blacknbunny/CVE-2018-10933hook-s3c/CVE-2018-10933kn6869610/CVE-2018-10933jobroche/libssh-scanner
Metasploit modules: 1 moduleauxiliary/scanner/ssh/libssh_auth_bypassrank: normalModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.

Sources

CNACVSS 3.09.1known since 2026-10-23
NVDCVSS 3.09.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
CNAweakness (CWE)CWE-592known since 2026-10-23
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score91.8 %read 2026-11-02
PoC-in-GitHubproof of concept20read 2026-11-02
Exploit-DBdetectionread 2026-11-02
Metasploit FrameworkMetasploit modules1known since 2026-11-01
OSVaffected packages—

Identifiers

EUVD-2018-2986same flawENISA EUVD · LicenseRef-ENISA-legal-notice
auxiliary/scanner/ssh/libssh_auth_bypassexploit moduleMetasploit Framework © Rapid7 · BSD-3-Clause
DLA-1548-1advisory covering several CVEsDebian · LicenseRef-unstated
DSA-4322-1advisory covering several CVEsDebian · LicenseRef-unstated
MGASA-2019-0043advisory covering several CVEsMageia · LicenseRef-unstated
openSUSE-SU-2024:10998-1advisory covering several CVEsopenSUSE · LicenseRef-unstated
RHBA-2018:3712advisory covering several CVEsRed Hat · CC-BY-4.0
SUSE-SU-2018:3162-1advisory covering several CVEsSUSE · LicenseRef-unstated
SUSE-SU-2018:3253-1advisory covering several CVEsSUSE · LicenseRef-unstated
USN-3795-1advisory covering several CVEsUbuntu

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2018-10-17
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-10933?

Is CVE-2018-10933 actively exploited?

Active exploitation of CVE-2018-10933 has not been confirmed. Its EPSS score was 91.8% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-10933?

CVE-2018-10933 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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Sources for this record

CISA ICS advisories (CSAF) · Public domain (US Government work)
CVE Program · CVE Program Terms of Use
ENISA EU Vulnerability Database · ENISA legal notice §1.2 (reproduction authorised, provided the source is acknowledged)
Exploit-DB · Exploit-DB terms of service · terms restrict redistribution
FIRST EPSS · EPSS terms of use (free use, attribution requested)
Metasploit Framework · BSD-3-Clause
NVD · Public domain (17 U.S.C. § 105) for NVD-authored data; third-party content under its own terms
OSV.dev · Per record, as its publisher states it: each row carries the label in sourceLicense when one is served
PoC-in-GitHub · CC0-1.0
Red Hat Product Security (CSAF and VEX) · CC-BY-4.0

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