What’s Vulnerable › Vulnerabilities

CVE-2009-3287

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-09-22 · updated 2026-06-16
• Weakness: CWE-20

Description

lib/thin/connection.rb in Thin web server before 1.2.4 relies on the X-Forwarded-For header to determine the IP address of the client, which allows remote attackers to spoof the IP address and hide activities via a modified X-Forwarded-For header.

Affected products

• Macournoyer Thin: through 1.2.2; 0.4.0, 0.4.1, 0.5.0, 0.5.1, 0.5.2, 0.5.3 (+14)

References

• http://github.com/macournoyer/thin/blob/master/CHANGELOG
• http://github.com/macournoyer/thin/commit/7bd027914c5ffd36bb408ef47dc749de3b6e063a
• http://www.openwall.com/lists/oss-security/2009/09/12/1
• http://github.com/macournoyer/thin/blob/master/CHANGELOG
• http://github.com/macournoyer/thin/commit/7bd027914c5ffd36bb408ef47dc749de3b6e063a
• http://www.openwall.com/lists/oss-security/2009/09/12/1

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