CVE-2016-2337

Exp

Type confusion exists in _cancel_eval Ruby's TclTkIp class method. Attacker passing different type of object than String as "retval" argument can cause arbitrary code execution.

Published: 2017-01-06 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-2337 is rated High Exploit Risk (91.6/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.15%, 93th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +5.10% 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-2016-2337

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

Exploit prediction scoring system (EPSS) score for CVE-2016-2337

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 1.05% 6.15% +5.10%
2 2026-06-12 0.80% 1.05% +0.24%
3 2025-09-22 — 0.80% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-2337

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2016-2337

OS Trackers for CVE-2016-2337

vendor priority summary link
gentoo normal CVE-2016-2337: 1 GLSA(s) (201710-18), 1 atom(s) (dev-lang/ruby); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-2337
redhat medium — https://access.redhat.com/security/cve/CVE-2016-2337
suse medium CVE-2016-2337 severity moderate: SUSE including 7 source package names (ruby, ruby-devel, …), 16 product×package rows across 6 product lines (SUSE Lifecycle Management Server 1.3, SUSE Linux Enterprise Server 11 SP1 for Teradata, … (6 product lines)): Known Not Affected 16. https://www.suse.com/security/cve/CVE-2016-2337/
ubuntu negligible CVE-2016-2337 negligible priority: Ubuntu including 4 source packages (ruby1.8, ruby1.9.1, ruby2.0, ruby2.3), 24 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): DNE 13, needs-triage 4, not-affected 3, ignored 2, released 2. https://ubuntu.com/security/CVE-2016-2337

NVD evaluator notes for CVE-2016-2337

Comment: <a href="http://cwe.mitre.org/data/definitions/843.html">CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')</a>

Affected software / configurations for CVE-2016-2337

Vendor Product Version Raw CPE
ruby-lang ruby 2.2.2 cpe:2.3:a:ruby-lang:ruby:2.2.2:*:*:*:*:*:*:*
ruby-lang ruby 2.3.0 cpe:2.3:a:ruby-lang:ruby:2.3.0:*:*:*:*:*:*:*

References for CVE-2016-2337

cvelogic Threat Intelligence