Web Server HTTP User-Agent Header Handling Remote Overflow

High Nessus Plugin ID 11069


The remote host is running a web server with a remote buffer overflow vulnerability.


It was possible to kill the web server by sending an invalid GET request with a long User-Agent field. A remote attacker may exploit this vulnerability to make the web server crash continually or possibly execute arbitrary code.


Upgrade your software or protect it with a filtering reverse proxy.

See Also



Plugin Details

Severity: High

ID: 11069

File Name: www_too_long_useragent.nasl

Version: 1.34

Type: remote

Family: Web Servers

Published: 2002/08/13

Updated: 2018/11/15

Dependencies: 10582, 10107

Configuration: Enable paranoid mode

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.5

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

Vulnerability Information

Required KB Items: Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 2001/10/18

Reference Information

CVE: CVE-2001-0836

BID: 3443, 3449