CVE-2009-2055
Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability - [Actively Exploited]
Description
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.
INFO
Published Date :
Aug. 19, 2009, 5:30 p.m.
Last Modified :
Oct. 22, 2025, 1:15 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).
Apply updates per vendor instructions.
https://nvd.nist.gov/vuln/detail/CVE-2009-2055
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source | 
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | 
Solution
- Upgrade to the relevant fixed version referenced in Cisco bug ID CSCtb18562
 
Public PoC/Exploit Available at Github
                                            CVE-2009-2055 has a 2 public
                                            PoC/Exploit available at Github.
                                            Go to the Public Exploits tab to see the list.
                                        
References to Advisories, Solutions, and Tools
                                            Here, you will find a curated list of external links that provide in-depth
                                            information, practical solutions, and valuable tools related to
                                            CVE-2009-2055.
                                        
CWE - Common Weakness Enumeration
            While CVE identifies
            specific instances of vulnerabilities, CWE categorizes the common flaws or
            weaknesses that can lead to vulnerabilities. CVE-2009-2055 is
            associated with the following CWEs:
        
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
            (CAPEC)
            stores attack patterns, which are descriptions of the common attributes and
            approaches employed by adversaries to exploit the CVE-2009-2055
            weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
A basic Python program to check Cybersecurity & Infrastructure Security Agency (CISA) Known Exploited Vulnerabilities (KEV) Catalog
Python
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
Results are limited to the first 15 repositories due to potential performance issues.
			The following list is the news that have been mention
			CVE-2009-2055 vulnerability anywhere in the article.
		
                The following table lists the changes that have been made to the
                CVE-2009-2055 vulnerability over time.
            
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
- 
                            
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 22, 2025
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055  - 
                            
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 21, 2025
Action Type Old Value New Value Removed Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055  - 
                            
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 21, 2025
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055  - 
                            
Modified Analysis by [email protected]
Jan. 06, 2025
Action Type Old Value New Value Changed Reference Type http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html No Types Assigned http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html Mailing List Changed Reference Type http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html No Types Assigned http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html Mailing List Changed Reference Type http://securitytracker.com/id?1022739 No Types Assigned http://securitytracker.com/id?1022739 Broken Link Changed Reference Type http://securitytracker.com/id?1022739 No Types Assigned http://securitytracker.com/id?1022739 Broken Link  - 
                            
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html Added Reference http://securitytracker.com/id?1022739 Added Reference http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml  - 
                            
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value  - 
                            
Initial Analysis by [email protected]
Aug. 20, 2009
Action Type Old Value New Value  
Vulnerability Scoring Details
Base CVSS Score: 4.3
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.67 }} 0.43%
score
0.81434
percentile