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Vulnerability record · CVE-2009-5111 · published 27 December 2011

CVE-2009-5111: Goahead webserver vulnerability

Goahead · Goahead Webserver

GoAhead WebServer allows remote attackers to cause a denial of service (daemon outage) via partial HTTP requests, as demonstrated by Slowloris.

5.0 CVSS 2.0 Medium EPSS 1.1% · top 35.2% CWE-399 · CWE-399
5.0CVSS 2.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
16 Jun 2026Last modified by NVD

Description

GoAhead WebServer allows remote attackers to cause a denial of service (daemon outage) via partial HTTP requests, as demonstrated by Slowloris.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://ha.ckers.org/slowloris/
http://ha.ckers.org/slowloris/

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2002-2431Goahead webserver vulnerabilityUnspecified vulnerability in GoAhead WebServer before 2.1.4 allows remote attackers to cause "incorrect behavior" via unknown "malicious code," relat…EPSS 1.2%5.0CVE-2002-2427Goahead webserver improper authentication vulnerabilityThe security handler in GoAhead WebServer before 2.1.1 allows remote attackers to bypass authentication and obtain access to protected web content vi…EPSS 1.3%5.0CVE-2002-2428Goahead webserver improper input validation vulnerabilitywebs.c in GoAhead WebServer before 2.1.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an HTTP…EPSS 1.6%5.0CVE-2002-2429Goahead webserver improper input validation vulnerabilitywebs.c in GoAhead WebServer before 2.1.4 allows remote attackers to cause a denial of service (daemon crash) via an HTTP POST request that contains a…EPSS 1.1%5.0CVE-2002-2430Goahead webserver vulnerabilityGoAhead WebServer before 2.1.1 allows remote attackers to cause a denial of service (CPU consumption) by performing a socket disconnect to terminate …EPSS 1.1%5.0CVE-2003-1568Goahead webserver improper input validation vulnerabilityGoAhead WebServer before 2.1.6 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an invalid URL, r…EPSS 1.6%5.0CVE-2003-1569Goahead webserver improper input validation vulnerabilityGoAhead WebServer before 2.1.5 on Windows 95, 98, and ME allows remote attackers to cause a denial of service (daemon crash) via an HTTP request with…EPSS 1.1%4.3CVE-2011-4273Goahead webserver cross-site scripting vulnerabilityMultiple cross-site scripting (XSS) vulnerabilities in GoAhead Webserver 2.18 allow remote attackers to inject arbitrary web script or HTML via (1) t…EPSS 4.8%

Source: NIST National Vulnerability Database (record CVE-2009-5111), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.