CVE-2015-2171 is a high-severity code injection vulnerability in slim/slim (composer), affecting versions < 2.6.0. It is fixed in 2.6.0.
Middleware/SessionCookie.php in Slim before 2.6.0 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via crafted session data.
Untrusted input is evaluated as executable code within the application's runtime environment. Typical impact: arbitrary code execution within the application's privilege context.
composer
slim/slim (< 2.6.0)slim/slim → 2.6.0 (composer)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's Application Detection and Response identifies whether CVE-2015-2171 is reachable in your applications. Explore runtime application protection for your team.
See if CVE-2015-2171 is reachable in your applications. Get a demo
Already deployed Kodem? See CVE-2015-2171 in your environment →Upgrade slim/slim to 2.6.0 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2015-2171 is a high-severity code injection vulnerability in slim/slim (composer), affecting versions < 2.6.0. It is fixed in 2.6.0. Untrusted input is evaluated as executable code within the application's runtime environment.
slim/slim (composer) versions < 2.6.0 is affected.
Yes. CVE-2015-2171 is fixed in 2.6.0. Upgrade to this version or later.
Whether CVE-2015-2171 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade slim/slim to 2.6.0 or later.