CVE-2018-10933

CRITICALNVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score elevated to 9.1 because EPSS predicts 92% probability of exploitation within the next 30 days (top 0.2% of all CVEs). NVD baseline CVSS 9.1 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekWeaponized
9.1
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 92%
CISA-KEV: Not listedEPSS: 92%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
9.1
EG Score
9.1(high)
EPSS
99.8%
KEV
Not listed

Published

October 17, 2018

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Jul 21, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic
https://www.libssh.org/security/advisories/CVE-2018-10933.txt
generic🟡 PoC Available

libSSH - Authentication Bypass - Linux remote Exploit

https://www.exploit-db.com/exploits/45638/
generic

[SECURITY] [DSA 4322-1] libssh security update

https://www.debian.org/security/2018/dsa-4322
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20190118-0002/
generic

Security Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0016
generic Patch Available

[SECURITY] [DLA 1548-1] libssh security update

https://lists.debian.org/debian-lts-announce/2018/10/msg00010.html
redhat Patch Available

1614973 – (CVE-2018-10933) CVE-2018-10933 libssh: Authentication Bypass due to improper message callbacks implementation

Affected: Red Hat Enterprise Linux 7 Extras. No libssh packages are included in Red Hat Enterprise Linux 6 and earlier. This issue does

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10933
generic
http://www.securityfocus.com/bid/105677

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssh-4 (0.8.1-1ubuntu0.1) @ cosmic2026-05-28ubuntu
ubuntulibssh-gcrypt-dev (0.6.3-4.3ubuntu0.1) @ xenial2026-05-28ubuntu
redhatlibssh-0:0.7.1-7.el72018-11-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 14× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:12 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-21 15:21 UTCEPSS rescore
  4. 2026-07-21 04:11 UTCOSV refresh
  5. 2026-07-20 17:04 UTCEPSS rescore
  6. 2026-07-20 17:04 UTCEPSS rescore
  7. 2026-07-13 22:26 UTCEPSS rescore
  8. 2026-07-13 22:26 UTCEPSS rescore
  9. 2026-07-03 23:26 UTCOSV refresh
  10. 2026-07-02 16:54 UTCEPSS rescore
  11. 2026-06-28 04:53 UTCEPSS rescore
  12. 2026-06-28 04:53 UTCEPSS rescore
  13. 2026-06-23 21:30 UTCEPSS rescore
  14. 2026-06-23 21:30 UTCEPSS rescore
  15. 2026-06-18 17:50 UTCEPSS rescore
  16. 2026-06-17 17:50 UTCEPSS rescore
  17. 2026-06-15 17:45 UTCEPSS rescore
  18. 2026-06-15 11:13 UTCOSV refresh
  19. 2026-06-13 22:58 UTCEPSS rescore
  20. 2026-06-13 22:57 UTCEPSS rescore
  21. 2026-06-12 23:09 UTCEPSS rescore
  22. 2026-06-12 23:09 UTCEPSS rescore
  23. 2026-06-11 13:57 UTCEPSS rescore
  24. 2026-06-10 22:15 UTCEPSS rescore
  25. 2026-06-07 15:22 UTCEPSS rescore
Show 21 more
  1. 2026-06-07 15:22 UTCEPSS rescore
  2. 2026-06-06 13:45 UTCEPSS rescore
  3. 2026-06-06 13:45 UTCEPSS rescore
  4. 2026-06-05 22:44 UTCEPSS rescore
  5. 2026-06-05 22:44 UTCEPSS rescore
  6. 2026-06-05 06:08 UTCEPSS rescore
  7. 2026-06-05 06:08 UTCEPSS rescore
  8. 2026-06-04 13:10 UTCEPSS rescore
  9. 2026-06-04 13:10 UTCEPSS rescore
  10. 2026-06-01 13:49 UTCEPSS rescore
  11. 2026-06-01 13:49 UTCEPSS rescore
  12. 2026-05-31 22:28 UTCEPSS rescore
  13. 2026-05-31 00:14 UTCEPSS rescore
  14. 2026-05-31 00:14 UTCEPSS rescore
  15. 2026-05-29 13:41 UTCEPSS rescore
  16. 2026-05-28 01:55 UTCEG score recompute
  17. 2026-05-28 01:55 UTCVendor advisory
  18. 2026-05-28 01:55 UTCGHSA enrichment
  19. 2026-05-27 13:38 UTCEPSS rescore
  20. 2026-05-27 13:38 UTCEPSS rescore
  21. 2026-05-26 00:16 UTCOSV refresh

Publicly available exploits

(10 references)

Working exploit code is in the public domain (8 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCHSw109/CVE-2018-10933
    First seen Apr 1, 2024

    Education purpose for CVE-2018-10933

    Open source ↗
  • GitHub PoCnikhil1232/LibSSH-Authentication-Bypass
    First seen Dec 19, 2018

    LibSSH Authentication Bypass CVE-2018-10933

    Open source ↗
  • Exploit-DBEDB-46307✓ verified
    First seen Oct 20, 2018

    LibSSH 0.7.6 / 0.8.4 - Unauthorized Access

    Open source ↗
  • GitHub PoCjas502n/CVE-2018-10933
    First seen Oct 20, 2018

    libssh CVE-2018-10933

    Open source ↗
  • GitHub PoCVirgula0/POC-CVE-2018-10933
    First seen Oct 20, 2018

    LibSSH Authentication Bypass Exploit using RCE

    Open source ↗
  • Exploit-DBEDB-45638
    First seen Oct 18, 2018

    libSSH - Authentication Bypass

    Open source ↗
  • GitHub PoChackerhouse-opensource/cve-2018-10933
    First seen Oct 18, 2018

    cve-2018-10933 libssh authentication bypass

    Open source ↗
  • GitHub PoCmarco-lancini/hunt-for-cve-2018-10933
    First seen Oct 18, 2018

    Hunt for and Exploit the libSSH Authentication Bypass (CVE-2018-10933)

    Open source ↗
  • GitHub PoCSoledaD208/CVE-2018-10933
    First seen Oct 17, 2018

    CVE-2018-10933 very simple POC

    Open source ↗
  • GitHub PoCblacknbunny/CVE-2018-10933
    First seen Oct 17, 2018

    Spawn to shell without any credentials by using CVE-2018-10933 (LibSSH)

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-10933?
CVE-2018-10933 is a critical vulnerability published on October 17, 2018. 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.
When was CVE-2018-10933 disclosed?
CVE-2018-10933 was first published in the National Vulnerability Database on October 17, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-10933 actively exploited?
CVE-2018-10933 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-10933?
CVE-2018-10933 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2018-10933?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-10933, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2018-10933

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