nse_libssh2.cc in Nmap 7.70 is subject to a denial of service condition due to a double…
Priority LOW 39CWE-415Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-415 and the CVSS impact.
Summary
nse_libssh2.cc in Nmap 7.70 is subject to a denial of service condition due to a double free when an SSH connection fails, as demonstrated by a leading \n character to ssh-brute.nse or ssh-auth-methods.nse.
Why it matters now
EPSS 0.03164 88th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2017-18594
- 2026-10-03 Alias added: GHSA-mh4c-hqr8-mc3f
References
Patch 2
More Nmap vulnerabilities
- TI-2026-41812 Nmap - Integer Underflow in IPv6 Extension Header Parsing CVSS 4.0MEDIUM 6.9
- TI-2018-10857 Nmap through 7.70, when the -sV option is used, allows remote attackers to cause a denial… CVSS 3.0HIGH 7.5
- TI-2013-04289 The http-domino-enum-passwords.nse script in NMap before 6.40, when… CVSS 2.0MEDIUM 6.8
- TI-2026-00008 Protection mechanism failure in Google Android CVSS 3.1HIGH 8.4
- TI-2018-15812 nmap version 6.49BETA6 through 7.60, up to and including SVN revision 37147 contains a… CVSS 3.0MEDIUM 5.7
Sources
- CVE-2017-18594 · CVE Program
- CVE-2017-18594 · NVD
- FIRST EPSS
- GHSA-mh4c-hqr8-mc3f · GitHub Advisory Database · CC BY 4.0
- CVE-2017-18594 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences