CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2	$0-$5k	0.00

A vulnerability classified as critical has been found in Cisco IOS XR 4.3.1 (Router Operating System). This affects an unknown code block of the component UDP Packet Handler. The manipulation with an unknown input leads to a resource management vulnerability. CWE is classifying the issue as CWE-399. This is going to have an impact on availability. The summary by CVE is:

The UDP process in Cisco IOS XR 4.3.1 does not free packet memory upon detecting full packet queues, which allows remote attackers to cause a denial of service (memory consumption) via UDP packets to listening ports, aka Bug ID CSCue69413.

The weakness was published 10/02/2013 as cisco-sa-20131002-iosxr as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. The public release has been coordinated with Cisco. This vulnerability is uniquely identified as CVE-2013-5503 since 08/22/2013. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 71437 (Cisco IOS XR Software Memory Exhaustion Vulnerability (cisco-sa-20131002-iosxr)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO.

Upgrading to version 4.3.2 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (71437).

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS XR

Version

• 4.3.1

License

• commercial

Support

• end of life (old version)

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

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

CVSSv3info

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: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 71437
Nessus Name: Cisco IOS XR Software Memory Exhaustion Vulnerability (cisco-sa-20131002-iosxr)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: IOS XR 4.3.2

Timelineinfo

08/22/2013 🔍
10/02/2013 +41 days 🔍
10/02/2013 +0 days 🔍
10/02/2013 +0 days 🔍
10/02/2013 +0 days 🔍
10/03/2013 +1 days 🔍
10/06/2013 +3 days 🔍
12/14/2013 +69 days 🔍
05/26/2021 +2720 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20131002-iosxr
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2013-5503 (🔍)
Vulnerability Center: 41771 - [cisco-sa-20131002-iosxr] Cisco IOS XR 4.3.1 Remote DoS via UDP Packets, High
SecurityFocus: 62770
OSVDB: 98022

scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 10/03/2013 17:09
Updated: 05/26/2021 09:06
Changes: 10/03/2013 17:09 (46), 05/12/2017 14:20 (23), 05/26/2021 09:06 (3)
Complete: 🔍
Committer:

Discussion

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