Exploitation evidence
Known exploited · CISA KEV listed
Added 2022-03-25. Ransomware campaign use: Unknown.
CISA required action: Apply updates per vendor instructions.
CISA due date: 2022-04-15. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
n/a / n/a
Default status: Not specified
- affected: n/a
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.03314,
"percentile": 0.88744
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.03314,
"percentile": 0.88672
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.03314,
"percentile": 0.88657
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.03314,
"percentile": 0.88651
}08 Nov 2026, 00:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-07T05:36:20.975Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
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"references": [
{
"name": "[nanog] 20090817 RE: Anyone else seeing \"(invalid or corrupt AS path) 3 bytes E01100\" ?",
"tags": [
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},
{
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{
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"x_transferred"
],
"url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2009-2055",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-11-08T17:41:43.520580Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2022-03-25",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055"
},
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}
}
],
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"description": "CWE-20 Improper Input Validation",
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]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-12T20:39:47.917Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
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"version": "n/a"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"problemTypes": [
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],
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},
"references": [
{
"name": "[nanog] 20090817 RE: Anyone else seeing \"(invalid or corrupt AS path) 3 bytes E01100\" ?",
"tags": [
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],
"url": "http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html"
},
{
"name": "1022739",
"tags": [
"vdb-entry",
"x_refsource_SECTRACK"
],
"url": "http://securitytracker.com/id?1022739"
},
{
"name": "20090818 Cisco IOS XR Software Border Gateway Protocol Vulnerability",
"tags": [
"vendor-advisory",
"x_refsource_CISCO"
],
"url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "psirt@cisco.com",
"ID": "CVE-2009-2055",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "n/a",
"version": {
"version_data": [
{
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}
]
}
}
]
},
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},
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}
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},
"problemtype": {
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},
"references": {
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{
"name": "[nanog] 20090817 RE: Anyone else seeing \"(invalid or corrupt AS path) 3 bytes E01100\" ?",
"refsource": "MLIST",
"url": "http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html"
},
{
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"url": "http://securitytracker.com/id?1022739"
},
{
"name": "20090818 Cisco IOS XR Software Border Gateway Protocol Vulnerability",
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"url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2009-2055",
"datePublished": "2009-08-19T17:00:00.000Z",
"dateReserved": "2009-06-12T00:00:00.000Z",
"dateUpdated": "2026-01-12T20:39:47.917Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.03314,
"percentile": 0.88642
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.03314,
"percentile": 0.88623
}05 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.03314,
"percentile": 0.88615
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.03314,
"percentile": 0.88605
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.03314,
"percentile": 0.88585
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.03314,
"percentile": 0.88571
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2009-2055",
"cwes": [
"CWE-20"
],
"dateAdded": "2022-03-25",
"dueDate": "2022-04-15",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2009-2055",
"product": "IOS XR",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).",
"vendorProject": "Cisco",
"vulnerabilityName": "Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability"
}