What’s Vulnerable › Vulnerabilities

CVE-2017-18594

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-08-29 · updated 2026-06-17
• Weakness: CWE-415

Description

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.

Affected products

• Nmap: 7.70

References

• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00073.html
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00075.html
• https://github.com/AMatchandaHaystack/Research/blob/master/Nmap%26libsshDF
• https://github.com/nmap/nmap/commit/350bbe0597d37ad67abe5fef8fba984707b4e9ad
• https://github.com/nmap/nmap/issues/1077
• https://github.com/nmap/nmap/issues/1227
• https://seclists.org/nmap-announce/2019/0
• https://seclists.org/nmap-dev/2018/q2/45
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00073.html
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00075.html
• https://github.com/AMatchandaHaystack/Research/blob/master/Nmap%26libsshDF
• https://github.com/nmap/nmap/commit/350bbe0597d37ad67abe5fef8fba984707b4e9ad

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