Vulnerability Database

393,392

Total vulnerabilities in the database

CVE-2011-2705 — ruby-lang / ruby

Improper Input Validation

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x before 1.9.2-p290 relies on PID values for initialization, which makes it easier for context-dependent attackers to predict the result string by leveraging knowledge of random strings obtained in an earlier process with the same PID.

  • Published: Aug 5, 2011
  • Updated: Oct 3, 2026
  • CVE: CVE-2011-2705
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:P/I:N/A:N

CWEs:

Software Affected versions
ruby-lang / ruby <= 1.8.7-334
ruby-lang / ruby = 1.8.7-p22
ruby-lang / ruby = 1.8.7-p71
ruby-lang / ruby = 1.8.7-p72
ruby-lang / ruby = 1.8.7-160
ruby-lang / ruby = 1.8.7-173
ruby-lang / ruby = 1.8.7-248
ruby-lang / ruby = 1.8.7-249
ruby-lang / ruby = 1.8.7-299
ruby-lang / ruby = 1.8.7-302
ruby-lang / ruby = 1.8.7-330
ruby-lang / ruby = 1.8.7-p21
ruby-lang / ruby = 1.9
ruby-lang / ruby = 1.9-r18423
ruby-lang / ruby = 1.9.0
ruby-lang / ruby = 1.9.0-r18423
ruby-lang / ruby = 1.9.0-0
ruby-lang / ruby = 1.9.0-1
ruby-lang / ruby = 1.9.0-2
ruby-lang / ruby = 1.9.0-20060415
ruby-lang / ruby = 1.9.0-20070709
ruby-lang / ruby = 1.9.1
ruby-lang / ruby = 1.9.1--p0
ruby-lang / ruby = 1.9.1--p129
ruby-lang / ruby = 1.9.1--p243
ruby-lang / ruby = 1.9.1--p376
ruby-lang / ruby = 1.9.1--p429
ruby-lang / ruby = 1.9.1--preview_1
ruby-lang / ruby = 1.9.1--preview_2
ruby-lang / ruby = 1.9.1--rc1
ruby-lang / ruby = 1.9.1--rc2
ruby-lang / ruby = 1.9.2
ruby-lang / ruby = 1.9.2-dev
ruby-lang / ruby = 1.9.2-p136
ruby-lang / ruby = 1.9.2-p180

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.