CVE-2009-2055 (GCVE-0-2009-2055)
Vulnerability from cvelistv5 – Published: 2009-08-19 17:00 – Updated: 2026-01-12 20:39Summary
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.
Severity
5.9 (Medium)
SSVC
Exploitation: active
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-08 17:41 UTC
CWE
- n/a
- CWE-20 - Improper Input Validation
Assigner
References
4 references
| URL | Tags |
|---|---|
| http://mailman.nanog.org/pipermail/nanog/2009-Aug… | mailing-listx_refsource_MLIST |
| http://securitytracker.com/id?1022739 | vdb-entryx_refsource_SECTRACK |
| http://www.cisco.com/en/US/products/products_secu… | vendor-advisoryx_refsource_CISCO |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 13d51342-21a5-483d-8527-1abf0201fd60
Exploited: Yes
Timestamps
First Seen: 2022-03-25
Asserted: 2022-03-25
Scope
Notes: KEV entry: Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability | Affected: Cisco / IOS XR | Description: Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS). | Required action: Apply updates per vendor instructions. | Due date: 2022-04-15 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2009-2055
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-20 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | IOS XR |
| Due Date | 2022-04-15 |
| Date Added | 2022-03-25 |
| Vendorproject | Cisco |
| Vulnerabilityname | Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:28 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 59bbdf72-7934-499f-8ce5-f32c76a41804
Exploited: Yes
Timestamps
First Seen: 2022-03-25
Asserted: 2022-03-25
Scope
Notes: KEVIntel entry: 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... | Affected: Cisco / IOS XR | CVSS: 5.9 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | 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... |
| Vendor | Cisco |
| Product | IOS XR |
| Added Date | 2022-03-25T00:00:00.000Z |
| Cvss Score | 5.9 |
| Epss Score | None |
| Cvss Severity | MEDIUM |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:05 UTC
| Updated: 2026-07-10 06:14 UTC
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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