Vulnerability Name:

CVE-2019-12647 (CCN-167617)

Assigned:2019-09-25
Published:2019-09-25
Updated:2019-10-09
Summary:A vulnerability in the Ident protocol handler of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability exists because the affected software incorrectly handles memory structures, leading to a NULL pointer dereference. An attacker could exploit this vulnerability by opening a TCP connection to specific ports and sending traffic over that connection. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
8.6 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:7.8 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2019-12647

Source: XF
Type: UNKNOWN
cisco-cve201912647-dos(167617)

Source: CCN
Type: Cisco Security Advisory cisco-sa-20190925-identd-dos
Cisco IOS and IOS XE Software IP Ident Denial of Service Vulnerability

Source: CISCO
Type: Vendor Advisory
20190925 Cisco IOS and IOS XE Software IP Ident Denial of Service Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/o:cisco:ios_xe:16.7.1:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:1100:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:4221:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:4321:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:4351:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:4431:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:4451-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_1000:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_1001-hx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_1001-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_1002-hx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_1002-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr_900:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-10sz-pd:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-12cz-a:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-12cz-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-12sz-im:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-24sz-im:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-24sz-m:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-24tz-m:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-4sz-a:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asr-920-4sz-d:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:cloud_services_router_1000v:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:ncs_4201:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:ncs_4202:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:ncs_4206:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:ncs_4216:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:network_convergence_system_520:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:cisco:ios_software:*:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:ios_xe_software:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco ios xe fuji-16.7.1
    cisco ios xe fuji-16.8.1
    cisco 1100 -
    cisco 4221 -
    cisco 4321 -
    cisco 4351 -
    cisco 4431 -
    cisco 4451-x -
    cisco asr 1000 -
    cisco asr 1001-hx -
    cisco asr 1001-x -
    cisco asr 1002-hx -
    cisco asr 1002-x -
    cisco asr 900 -
    cisco asr-920-10sz-pd -
    cisco asr-920-12cz-a -
    cisco asr-920-12cz-d -
    cisco asr-920-12sz-im -
    cisco asr-920-24sz-im -
    cisco asr-920-24sz-m -
    cisco asr-920-24tz-m -
    cisco asr-920-4sz-a -
    cisco asr-920-4sz-d -
    cisco cloud services router 1000v -
    cisco ncs 4201 -
    cisco ncs 4202 -
    cisco ncs 4206 -
    cisco ncs 4216 -
    cisco network convergence system 520 -
    cisco ios software *
    cisco ios xe software *