Input validation error in Squid-cache Squid

Published: 2011-09-06 | Updated: 2020-08-11
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE ID CVE-2011-3205
Exploitation vector Network
Public exploit N/A
Vulnerable software
Server applications / IDS/IPS systems, Firewalls and proxy servers


Security Advisory

This security advisory describes one medium risk vulnerability.

1) Input validation error

Risk: Medium

CVSSv3: 6.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:C] [PCI]

CVE-ID: CVE-2011-3205

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows remote Gopher servers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (memory corruption and daemon restart) or possibly have unspecified other impact via a long line in a response.


Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Squid: 3.0.stable1, 3.0.stable2, 3.0.stable3, 3.0.stable4, 3.0.stable5, 3.0.stable6, 3.0.stable7, 3.0.stable8, 3.0.stable9, 3.0.stable10, 3.0.stable11, 3.0.stable12, 3.0.stable13, 3.0.stable14, 3.0.stable15, 3.0.stable16, 3.0.stable17, 3.0.stable18, 3.0.stable19, 3.0.stable20, 3.0.stable21, 3.0.stable22, 3.0.stable23, 3.0.stable24, 3.0.stable25, 3.1,,,,,,,,,,,,,,,,,,, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5,, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.1.10, 3.1.11, 3.1.12, 3.1.13, 3.1.14,,,,,,,,,,

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.