CVE-2018-16470

There is a possible DoS vulnerability in the multipart parser in Rack before 2.0.6. Specially crafted requests can cause the multipart parser to enter a pathological state, causing the parser to use CPU resources disproportionate to the request size.

Published: 2018-11-13 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-16470 is rated Moderate Risk (59.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.03%). EPSS rose +1.86% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2018-16470

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 0.18% 2.03% +1.86%
2 2026-03-04 0.14% 0.18% +0.03%
3 2026-03-01 — 0.14% —

Full EPSS history (41 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-16470

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-2018-16470

GitHub Security Advisory for CVE-2018-16470

GHSA-hg78-4f6x-99wq · Severity: high · Ecosystem: rubygems — Rack vulnerable to Denial of Service

OS Trackers for CVE-2018-16470

vendor priority summary link
debian unimportant CVE-2018-16470 unimportant priority: Debian including 1 source packages (ruby-rack), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-16470
redhat medium — https://access.redhat.com/security/cve/CVE-2018-16470
suse medium CVE-2018-16470 severity moderate: SUSE including 27 source package names (rmt-server, rmt-server-1.1.1-3.13.1, …), 47 product×package rows across 29 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 4, … (29 product lines)): Known Not Affected 26, Fixed 21. https://www.suse.com/security/cve/CVE-2018-16470/
ubuntu medium CVE-2018-16470 medium priority: Ubuntu including 1 source packages (ruby-rack), 6 status rows across 6 suites (bionic, cosmic, disco, trusty, upstream, xenial): not-affected 5, ignored 1. https://ubuntu.com/security/CVE-2018-16470

Affected software / configurations for CVE-2018-16470

Vendor Product Version Raw CPE
rack_project rack 2.0.4 cpe:2.3:a:rack_project:rack:2.0.4:*:*:*:*:*:*:*
rack_project rack 2.0.5 cpe:2.3:a:rack_project:rack:2.0.5:*:*:*:*:*:*:*

References for CVE-2018-16470

cvelogic Threat Intelligence