CVE-2015-1242

The ReduceTransitionElementsKind function in hydrogen-check-elimination.cc in Google V8 before 4.2.77.8, as used in Google Chrome before 42.0.2311.90, allows remote attackers to cause a denial of service or possibly have unspecified other impact via crafted JavaScript code that leverages "type confusion" in the check-elimination optimization.

Published: 2015-04-19 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-1242 is rated Moderate Risk (58.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.65%). 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-2015-1242

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 2025-10-05 2.03% 1.65% -0.38%
2 2025-07-16 2.22% 2.03% -0.19%
3 2025-05-10 — 2.22% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-1242

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
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-2015-1242

OS Trackers for CVE-2015-1242

vendor priority summary link
gentoo normal CVE-2015-1242: 1 GLSA(s) (201506-04), 1 atom(s) (www-client/chromium); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-1242
redhat high — https://access.redhat.com/security/cve/CVE-2015-1242
ubuntu medium CVE-2015-1242 medium priority: Ubuntu including 2 source packages (chromium-browser, oxide-qt), 14 status rows across 7 suites (lucid, precise, trusty, upstream, utopic, vivid, wily): released 10, DNE 2, ignored 2. https://ubuntu.com/security/CVE-2015-1242

NVD evaluator notes for CVE-2015-1242

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

Affected software / configurations for CVE-2015-1242

Vendor Product Version Raw CPE
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 14.10 cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*
canonical ubuntu_linux 15.04 cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
google v8 <= 4.2.77.7 cpe:2.3:a:google:v8:*:*:*:*:*:*:*:*
google chrome <= 42.0.2311.60 cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

References for CVE-2015-1242

cvelogic Threat Intelligence