Cisco IOS XR up to 3.4.2 input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.6$5k-$25k0.00

Summaryinfo

A vulnerability was found in Cisco IOS XR up to 3.4.2. It has been declared as problematic. This affects an unknown part. The manipulation results in input validation. This vulnerability is cataloged as CVE-2009-2055. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in Cisco IOS XR up to 3.4.2 (Router Operating System). It has been classified as problematic. Affected is some unknown processing. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009.

The weakness was shared 08/19/2009 (Website). The advisory is shared for download at cisco.com. This vulnerability is traded as CVE-2009-2055. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but an exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 04/22/2026).

It is declared as attacked. This issue was added on 03/25/2022 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 04/15/2022:

Apply updates per vendor instructions.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at EUVD (EUVD-2009-2051), SecurityFocus (BID 36063†), SecurityTracker (ID 1022739†) and Vulnerability Center (SBV-23250†). The entries VDB-49580 and VDB-49578 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

ADP CISA Base Score: 5.9
ADP CISA Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/12/2009 🔍
08/18/2009 +67 days 🔍
08/18/2009 +0 days 🔍
08/19/2009 +1 days 🔍
08/19/2009 +0 days 🔍
08/19/2009 +0 days 🔍
03/18/2015 +2037 days 🔍
04/22/2026 +4053 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco.com
Status: Confirmed

CVE: CVE-2009-2055 (🔍)
GCVE (CVE): GCVE-0-2009-2055
GCVE (VulDB): GCVE-100-49524
EUVD: 🔍
SecurityFocus: 36063 - Cisco IOS XR Invalid Border Gateway Protocol (BGP) Update Denial of Service Vulnerability
SecurityTracker: 1022739
Vulnerability Center: 23250 - [cisco-sa-20090818-bgp] Cisco IOS XR Invalid Border Gateway Protocol (BGP) Update, Medium

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

Entryinfo

Created: 03/18/2015 15:15
Updated: 04/22/2026 05:26
Changes: 03/18/2015 15:15 (48), 02/13/2017 10:17 (8), 08/20/2021 10:41 (3), 04/24/2024 08:02 (26), 07/27/2024 16:46 (1), 09/09/2024 22:29 (1), 01/06/2025 21:33 (3), 07/30/2025 06:10 (1), 04/22/2026 05:26 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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