CVE-2019-12647: Cisco IOS and IOS XE Software IP Ident Denial of Service Vulnerability
First published: Wed Sep 25 2019(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-12647?
CVE-2019-12647 is a vulnerability in the Ident protocol handler of Cisco IOS and IOS XE Software that could allow an unauthenticated, remote attacker to cause an affected device to reload.
How severe is CVE-2019-12647?
CVE-2019-12647 has a severity rating of 7.5 (high).
How can an attacker exploit CVE-2019-12647?
An attacker can exploit CVE-2019-12647 by sending specially crafted Ident protocol packets to the affected device, causing it to reload.
Which versions of Cisco IOS and IOS XE Software are affected by CVE-2019-12647?
Cisco IOS XE Software versions fuji-16.7.1 and fuji-16.8.1 are affected by CVE-2019-12647.
How can I fix CVE-2019-12647?
To fix CVE-2019-12647, Cisco has released software updates that address the vulnerability. It is recommended to update to a fixed software version.
- collector/nvd-index
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/title
- agent/weakness
- agent/severity
- agent/last-modified-date
- agent/references
- agent/softwarecombine
- agent/author
- agent/tags
- agent/event
- agent/description
- agent/first-publish-date
- vendor/cisco
- canonical/cisco ios xe
- version/cisco ios xe/fuji-16.7.1
- version/cisco ios xe/fuji-16.8.1
- canonical/cisco 1100
- canonical/cisco 4221
- canonical/cisco 4321
- canonical/cisco 4351
- canonical/cisco 4431
- canonical/cisco 4451-x
- canonical/cisco asr 1000
- canonical/cisco asr 1001-hx
- canonical/cisco asr 1001-x
- canonical/cisco asr 1002-hx
- canonical/cisco asr 1002-x
- canonical/cisco asr 900
- canonical/cisco asr 920-10sz-pd
- canonical/cisco asr 920-12cz-a
- canonical/cisco asr 920-12cz-d
- canonical/cisco asr 920-12sz-im
- canonical/cisco asr 920-24sz-im
- canonical/cisco asr 920-24sz-m
- canonical/cisco asr 920-24tz-m
- canonical/cisco asr 920-4sz-a
- canonical/cisco asr 920-4sz-d
- canonical/cisco cloud services router 1000v
- canonical/cisco ncs 4201
- canonical/cisco ncs 4202
- canonical/cisco ncs 4206
- canonical/cisco ncs 4216
- canonical/cisco network convergence system 520