Cisco IOS up to 12.x resource management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in Cisco IOS up to 12.x (Router Operating System). It has been declared as critical. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. The summary by CVE is:

Cisco IOS before 15.0(1)XA does not properly handle IRC traffic during a specific time period after an initial reload, which allows remote attackers to cause a denial of service (device reload) via an attempted connection to a certain IRC server, related to a "corrupted magic value," aka Bug ID CSCso05336.

The weakness was released 01/07/2011 (Website). It is possible to read the advisory at This vulnerability is known as CVE-2009-5038. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 43207 (Cisco IOS Multiple Vulnerabilities).

Upgrading to version 12.1%2820%29ew4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at X-Force (64682).








  • end of life (old version)

CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍


VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Resource management
CWE: CWE-399 / CWE-404

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: IOS 12.1%2820%29ew4


01/07/2011 🔍
01/07/2011 +0 days 🔍
01/07/2011 +0 days 🔍
01/07/2011 +0 days 🔍
01/11/2011 +4 days 🔍
01/12/2011 +1 days 🔍
03/19/2015 +1527 days 🔍
10/11/2021 +2398 days 🔍



Status: Not defined
Confirmation: 🔍

CVE: CVE-2009-5038 (🔍)
X-Force: 64682
Vulnerability Center: 29050 - Cisco IOS before 15.0(1)XA Remote DoS Vulnerability via an Attempted Connection to an IRC Server, High
SecurityFocus: 45764 - Cisco IOS IRC server Remote Denial of Service Vulnerability


Created: 03/19/2015 11:27 PM
Updated: 10/11/2021 08:10 AM
Changes: 03/19/2015 11:27 PM (52), 03/13/2017 09:41 AM (9), 10/11/2021 08:10 AM (4)
Complete: 🔍
Cache ID: 3:E78:40


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