CVE-2016-0751

actionpack/lib/action_dispatch/http/mime_type.rb in Action Pack in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not properly restrict use of the MIME type cache, which allows remote attackers to cause a denial of service (memory consumption) via a crafted HTTP Accept header.

Published: 2016-02-15 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-0751 is rated Moderate Risk (64/100): CVSS High severity, with high exploitation likelihood (EPSS 9.73%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize 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-2016-0751

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 8.89% 9.73% +0.84%
2 2026-05-23 6.14% 8.89% +2.75%
3 2026-03-04 — 6.14% —

Full EPSS history (41 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-0751

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-2016-0751

GitHub Security Advisory for CVE-2016-0751

GHSA-ffpv-c4hm-3x6v · Severity: high · Ecosystem: rubygems — actionpack is vulnerable to denial of service via a crafted HTTP Accept header

OS Trackers for CVE-2016-0751

vendor priority summary link
debian not yet assigned CVE-2016-0751 not yet assigned priority: Debian including 1 source packages (rails), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-0751
redhat medium — https://access.redhat.com/security/cve/CVE-2016-0751
suse low CVE-2016-0751 severity low: SUSE including 15 source package names (libcontainment-insomnia-0.1.1-0.9.4.19, libjansson4-2.2.1-0.9.11.6, …), 30 product×package rows across 9 product lines (SUSE Enterprise Storage 2.1, SUSE Lifecycle Management Server 1.3, … (9 product lines)): Fixed 30. https://www.suse.com/security/cve/CVE-2016-0751/
ubuntu medium CVE-2016-0751 medium priority: Ubuntu including 10 source packages (rails, rails-4.0, …), 120 status rows across 12 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): DNE 96, not-affected 13, ignored 9, released 2. https://ubuntu.com/security/CVE-2016-0751

Affected software / configurations for CVE-2016-0751

Vendor Product Version Raw CPE
rubyonrails rails 4.0.0 cpe:2.3:a:rubyonrails:rails:4.0.0:-:*:*:*:*:*:*
rubyonrails rails 4.0.0 cpe:2.3:a:rubyonrails:rails:4.0.0:beta:*:*:*:*:*:*
rubyonrails rails 4.0.0 cpe:2.3:a:rubyonrails:rails:4.0.0:rc1:*:*:*:*:*:*
rubyonrails rails 4.0.0 cpe:2.3:a:rubyonrails:rails:4.0.0:rc2:*:*:*:*:*:*
rubyonrails rails 4.0.1 cpe:2.3:a:rubyonrails:rails:4.0.1:-:*:*:*:*:*:*
rubyonrails rails 4.0.1 cpe:2.3:a:rubyonrails:rails:4.0.1:rc1:*:*:*:*:*:*
rubyonrails rails 4.0.1 cpe:2.3:a:rubyonrails:rails:4.0.1:rc2:*:*:*:*:*:*
rubyonrails rails 4.0.1 cpe:2.3:a:rubyonrails:rails:4.0.1:rc3:*:*:*:*:*:*
rubyonrails rails 4.0.1 cpe:2.3:a:rubyonrails:rails:4.0.1:rc4:*:*:*:*:*:*
rubyonrails rails 4.0.2 cpe:2.3:a:rubyonrails:rails:4.0.2:*:*:*:*:*:*:*
rubyonrails rails 4.0.3 cpe:2.3:a:rubyonrails:rails:4.0.3:*:*:*:*:*:*:*
rubyonrails rails 4.0.4 cpe:2.3:a:rubyonrails:rails:4.0.4:*:*:*:*:*:*:*
rubyonrails rails 4.0.5 cpe:2.3:a:rubyonrails:rails:4.0.5:*:*:*:*:*:*:*
rubyonrails rails 4.0.6 cpe:2.3:a:rubyonrails:rails:4.0.6:*:*:*:*:*:*:*
rubyonrails rails 4.0.6 cpe:2.3:a:rubyonrails:rails:4.0.6:rc1:*:*:*:*:*:*
rubyonrails rails 4.0.6 cpe:2.3:a:rubyonrails:rails:4.0.6:rc2:*:*:*:*:*:*
rubyonrails rails 4.0.6 cpe:2.3:a:rubyonrails:rails:4.0.6:rc3:*:*:*:*:*:*
rubyonrails rails 4.0.7 cpe:2.3:a:rubyonrails:rails:4.0.7:*:*:*:*:*:*:*
rubyonrails rails 4.0.8 cpe:2.3:a:rubyonrails:rails:4.0.8:*:*:*:*:*:*:*
rubyonrails rails 4.0.9 cpe:2.3:a:rubyonrails:rails:4.0.9:*:*:*:*:*:*:*
rubyonrails rails 4.0.10 cpe:2.3:a:rubyonrails:rails:4.0.10:*:*:*:*:*:*:*
rubyonrails rails 4.0.10 cpe:2.3:a:rubyonrails:rails:4.0.10:rc1:*:*:*:*:*:*
rubyonrails rails 4.1.0 cpe:2.3:a:rubyonrails:rails:4.1.0:-:*:*:*:*:*:*
rubyonrails rails 4.1.0 cpe:2.3:a:rubyonrails:rails:4.1.0:beta1:*:*:*:*:*:*
rubyonrails rails 4.1.1 cpe:2.3:a:rubyonrails:rails:4.1.1:*:*:*:*:*:*:*
rubyonrails rails 4.1.2 cpe:2.3:a:rubyonrails:rails:4.1.2:*:*:*:*:*:*:*
rubyonrails rails 4.1.2 cpe:2.3:a:rubyonrails:rails:4.1.2:rc1:*:*:*:*:*:*
rubyonrails rails 4.1.2 cpe:2.3:a:rubyonrails:rails:4.1.2:rc2:*:*:*:*:*:*
rubyonrails rails 4.1.2 cpe:2.3:a:rubyonrails:rails:4.1.2:rc3:*:*:*:*:*:*
rubyonrails rails 4.1.3 cpe:2.3:a:rubyonrails:rails:4.1.3:*:*:*:*:*:*:*
rubyonrails rails 4.1.4 cpe:2.3:a:rubyonrails:rails:4.1.4:*:*:*:*:*:*:*
rubyonrails rails 4.1.5 cpe:2.3:a:rubyonrails:rails:4.1.5:*:*:*:*:*:*:*
rubyonrails rails 4.1.6 cpe:2.3:a:rubyonrails:rails:4.1.6:rc1:*:*:*:*:*:*
rubyonrails rails 4.1.7 cpe:2.3:a:rubyonrails:rails:4.1.7:*:*:*:*:*:*:*
rubyonrails rails 4.1.8 cpe:2.3:a:rubyonrails:rails:4.1.8:*:*:*:*:*:*:*
rubyonrails rails 4.1.9 cpe:2.3:a:rubyonrails:rails:4.1.9:*:*:*:*:*:*:*
rubyonrails rails 4.1.10 cpe:2.3:a:rubyonrails:rails:4.1.10:*:*:*:*:*:*:*
rubyonrails rails 4.1.12 cpe:2.3:a:rubyonrails:rails:4.1.12:*:*:*:*:*:*:*
rubyonrails rails 4.1.13 cpe:2.3:a:rubyonrails:rails:4.1.13:*:*:*:*:*:*:*
rubyonrails rails 4.2.0 cpe:2.3:a:rubyonrails:rails:4.2.0:beta1:*:*:*:*:*:*
rubyonrails rails 4.2.0 cpe:2.3:a:rubyonrails:rails:4.2.0:beta2:*:*:*:*:*:*
rubyonrails rails 4.2.0 cpe:2.3:a:rubyonrails:rails:4.2.0:beta3:*:*:*:*:*:*
rubyonrails rails 4.2.0 cpe:2.3:a:rubyonrails:rails:4.2.0:beta4:*:*:*:*:*:*
rubyonrails rails 4.2.0 cpe:2.3:a:rubyonrails:rails:4.2.0:rc1:*:*:*:*:*:*
rubyonrails rails 4.2.0 cpe:2.3:a:rubyonrails:rails:4.2.0:rc2:*:*:*:*:*:*
rubyonrails rails 4.2.0 cpe:2.3:a:rubyonrails:rails:4.2.0:rc3:*:*:*:*:*:*
rubyonrails rails 4.2.1 cpe:2.3:a:rubyonrails:rails:4.2.1:*:*:*:*:*:*:*
rubyonrails rails 4.2.1 cpe:2.3:a:rubyonrails:rails:4.2.1:rc1:*:*:*:*:*:*
rubyonrails rails 4.2.1 cpe:2.3:a:rubyonrails:rails:4.2.1:rc2:*:*:*:*:*:*
rubyonrails rails 4.2.1 cpe:2.3:a:rubyonrails:rails:4.2.1:rc3:*:*:*:*:*:*
rubyonrails rails 4.2.1 cpe:2.3:a:rubyonrails:rails:4.2.1:rc4:*:*:*:*:*:*
rubyonrails rails 4.2.2 cpe:2.3:a:rubyonrails:rails:4.2.2:*:*:*:*:*:*:*
rubyonrails rails 4.2.3 cpe:2.3:a:rubyonrails:rails:4.2.3:*:*:*:*:*:*:*
rubyonrails rails 4.2.3 cpe:2.3:a:rubyonrails:rails:4.2.3:rc1:*:*:*:*:*:*
rubyonrails rails 4.2.4 cpe:2.3:a:rubyonrails:rails:4.2.4:*:*:*:*:*:*:*
rubyonrails rails 4.2.4 cpe:2.3:a:rubyonrails:rails:4.2.4:rc1:*:*:*:*:*:*
rubyonrails rails 4.2.5 cpe:2.3:a:rubyonrails:rails:4.2.5:*:*:*:*:*:*:*
rubyonrails rails 4.2.5 cpe:2.3:a:rubyonrails:rails:4.2.5:rc1:*:*:*:*:*:*
rubyonrails rails 4.2.5 cpe:2.3:a:rubyonrails:rails:4.2.5:rc2:*:*:*:*:*:*
rubyonrails rails 5.0.0 cpe:2.3:a:rubyonrails:rails:5.0.0:beta1:*:*:*:*:*:*
rubyonrails ruby_on_rails <= 3.2.22 cpe:2.3:a:rubyonrails:ruby_on_rails:*:*:*:*:*:*:*:*
rubyonrails ruby_on_rails 4.0.10 cpe:2.3:a:rubyonrails:ruby_on_rails:4.0.10:rc2:*:*:*:*:*:*
rubyonrails ruby_on_rails 4.0.11 cpe:2.3:a:rubyonrails:ruby_on_rails:4.0.11:*:*:*:*:*:*:*
rubyonrails ruby_on_rails 4.0.11.1 cpe:2.3:a:rubyonrails:ruby_on_rails:4.0.11.1:*:*:*:*:*:*:*
rubyonrails ruby_on_rails 4.0.12 cpe:2.3:a:rubyonrails:ruby_on_rails:4.0.12:*:*:*:*:*:*:*
rubyonrails ruby_on_rails 4.0.13 cpe:2.3:a:rubyonrails:ruby_on_rails:4.0.13:*:*:*:*:*:*:*
rubyonrails ruby_on_rails 4.0.13 cpe:2.3:a:rubyonrails:ruby_on_rails:4.0.13:rc1:*:*:*:*:*:*
rubyonrails ruby_on_rails 4.1.11 cpe:2.3:a:rubyonrails:ruby_on_rails:4.1.11:*:*:*:*:*:*:*

References for CVE-2016-0751

cvelogic Threat Intelligence