CVE-2017-18594

Exp

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.

Published: 2019-08-29 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-18594 is rated High Exploit Risk (76.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.16%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.23% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-18594

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-18594

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.93% 3.16% +1.23%
2 2026-06-13 1.97% 1.93% -0.04%
3 2026-06-06 — 1.97% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18594

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-18594

OS Trackers for CVE-2017-18594

vendor priority summary link
alpine — CVE-2017-18594: 1 source package rows (nmap); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. https://security.alpinelinux.org/vuln/CVE-2017-18594
debian unimportant CVE-2017-18594 unimportant priority: Debian including 1 source packages (nmap), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-18594
redhat low — https://access.redhat.com/security/cve/CVE-2017-18594
suse medium CVE-2017-18594 severity moderate: SUSE including 23 source package names (ncat-7.70-3.12.1, ncat-7.70-lp150.2.9.1, …), 55 product×package rows across 33 product lines (SUSE Linux Enterprise High Performance Computing 12 SP4, SUSE Linux Enterprise Module for Basesystem 15, … (33 product lines)): Fixed 43, Known Not Affected 12. https://www.suse.com/security/cve/CVE-2017-18594/
ubuntu low CVE-2017-18594 low priority: Ubuntu including 1 source packages (nmap), 18 status rows across 18 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 13, needs-triage 3, ignored 1, released 1. https://ubuntu.com/security/CVE-2017-18594

Affected software / configurations for CVE-2017-18594

Vendor Product Version Raw CPE
nmap nmap 7.70 cpe:2.3:a:nmap:nmap:7.70:*:*:*:*:*:*:*

References for CVE-2017-18594

cvelogic Threat Intelligence