Vulnerability Intelligence Report
Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
CVE-2009-2055
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.
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
5.9
MEDIUM
Exploitability:2.3
Impact Score:3.6
EPSS Probability:3.33%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-20 ↗CWE-20 Improper Input Validation
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| cisco | ios_xr | 3.4, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.5, 3.5.2, 3.5.3, 3.5.4, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.7.0, 3.7.1, 3.7.2, 3.7.3, 3.8.0, 3.8.1 |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2009-06-12T00:00:00 |
| Published | 2009-08-19T17:00:00 |
| Last Updated | 2026-01-12T20:39:47 |
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