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CVE-2017-12319

MediumExploitedPublic exploit

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…

Published Mar 27, 2018 · Updated Jan 13, 2026

Key Facts

Patch immediately
  • CVE-2017-12319 is a medium-severity vulnerability (CVSS 5.9 v3.1) affecting IOS (Cisco), IOS Xe (Cisco).
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022. Public exploit code is available.
  • EPSS estimates a 5.2% probability of exploitation in the next 30 days.
  • Fixed versions are available, including IOS Xe 16.3.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

5.9

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS (30-day exploit likelihood)

5.2%

Higher than 92.4% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

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Description

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.

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVMar 3, 2022Mar 24, 2022Not reported
Industry KEV feedMar 3, 2022Mar 24, 2022Not reported
CIRCL KEVMar 3, 2022Mar 24, 2022Not reported
ENISA EUVDMar 3, 2022n/aNot reported

Required action: Apply updates per vendor instructions.

Affected Products

3 affected entries in total
ProductAffected versionsFixed in
IOSCisco15.4\(1\)sn/a
IOS XeCisco>= Cisco IOS XE16.3

Patched Releases

IOS Xe

16.3

Timeline

  1. Publicly disclosed

    Mar 27, 2018

  2. Added to CISA KEV

    Mar 3, 2022

  3. Added to Industry KEV feed

    Mar 3, 2022

  4. Added to CIRCL KEV

    Mar 3, 2022

  5. Added to ENISA EUVD

    Mar 3, 2022

  6. Last updated

    Jan 13, 2026

Weakness Type

  • CWE-20 Improper Input Validation

References

FAQ

Common Questions.

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