Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted HTTP request that is processed by a backtracking regular expression.
Published 2008-08-13 01:41:00
Updated 2018-10-11 20:48:59
Source MITRE
View at NVD,
Vulnerability category: Denial of service

Threat overview for CVE-2008-3656

Top countries where our scanners detected CVE-2008-3656
Top open port discovered on systems with this issue 443
IPs affected by CVE-2008-3656 1,791
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2008-3656!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2008-3656

Probability of exploitation activity in the next 30 days EPSS Score History
~ 95 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2008-3656

  • Ruby WEBrick::HTTP::DefaultFileHandler DoS
    Disclosure Date: 2008-08-08
    First seen: 2020-04-26
    The WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and earlier, 1.8.6 to 1.8.6-p286, 1.8.7 to 1.8.7-p71, and 1.9 to r18423 allows for a DoS (CPU consumption) via a crafted HTTP request. Authors: - kris katterjohn <>

CVSS scores for CVE-2008-3656

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen

CWE ids for CVE-2008-3656

  • Assigned by: (Primary)

References for CVE-2008-3656

Products affected by CVE-2008-3656

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