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Vulnerabilities/CVE-2017-12319Public Intelligence Dossier
Source: cisco · Limited verification•Last verified: •Collection Degraded
CVE-2017-12319ListedHIGH (raw)CVSS 7.1CWE-20

A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability

Published: 27 Mar 2018•Last updated: 17 Jun 2026, 06:33 AM IST•Source identifier: psirt@cisco.com
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added03 Mar 2022
Due24 Mar 2022
RansomwareUnknown
CVSS score
7.1HIGH (raw)
AV:N/AC:M/Au:N/C:N/I:N/A:C
Metric sourcenvd@nist.gov
EPSS probability
5.2%0.052
Percentile93rd
Weakness type
CWE-20
NVD-CWE-noinfo
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability. The vulnerability exists due to changes in the implementation of the BGP MPLS-Based Ethernet VPN RFC (RFC 7432) draft between IOS XE software releases. When the BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route update packet is received, it could be possible that the IP address length field is miscalculated. An attacker could exploit this vulnerability by sending a crafted BGP packet to an affected device after the BGP session was established. An exploit could allow the attacker to cause the affected device to reload or corrupt the BGP routing table; either outcome would result in a DoS. The vulnerability may be triggered when the router receives a crafted BGP message from a peer on an existing BGP session. This vulnerability affects all releases of Cisco IOS XE Software prior to software release 16.3 that support BGP EVPN configurations. If the device is not configured for EVPN, it is not vulnerable. Cisco Bug IDs: CSCui67191, CSCvg52875.

SOC priority

Immediate Attention

Actively exploited (source statement)

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; SOC ecosystem technology relevance; HIGH severity; Source-confirmed exploitation or CISA KEV/ransomware metadata

Affected Products & Remediation

2 source-backed products
Affected products and versions (source)
  • cisco ios · 15.4\(1\)s; xe < 16.3 · NVD CPE · Source
  • cisco ios xe · < 16.3 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:h:cisco:1000_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4g\/6g_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4g_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4gltegb_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4gltena_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4p_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-6g_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-8p_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-lte_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: Apply updates per vendor instructions.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA required action: Apply updates per vendor instructions.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

Catalog entry
03 Mar 2022
Required action due
24 Mar 2022
Known ransomware use
Unknown

Apply updates per vendor instructions.

Change History & Source Data

— No recorded material change

CNA / source
psirt@cisco.com
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:cisco:ios:15.4\(1\)s:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1000_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4g\/6g_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4g_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4gltegb_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4gltena_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-4p_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-6g_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:1100-8p_integrated_services_router:-:*:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2022-03-03tools.cisco.comSource recordnvd.nist.govSource recordcisa.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2017-12319
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2017-12319
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2017-12319"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.