Cisco · IOS and IOS XE Software
CVE-2018-0172
Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
What it is
A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition. Cisco Bug IDs: CSCvg62730.
CISA: A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow for denial-of-service (DoS).
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: March 17, 2022
- Added to the CISA list
- March 3, 2022
- Published
- March 28, 2018
- Severity
- High 8.6 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 7.8% in the top 5.4% of all known vulnerabilities
- Weakness
- CWE-20
- More details
- NVD · CVE.org · CISA
All references (6)
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- https://www.tenable.com/security/research/tra-2018-06
- http://www.securitytracker.com/id/1040591
- http://www.securityfocus.com/bid/103552
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr1
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
More exploited flaws from Cisco
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Apr 19, 2023 | SNMP Remote Code Execution | IOS and IOS XE Software | High 8.8 | 21% |
| Mar 3, 2022 | IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service | IOS and IOS XE Software | High 7.5 | 6.2% |
| Mar 3, 2022 | IOS Software and Cisco IOS XE Software Denial-of-Service | IOS and IOS XE Software | Medium 6.5 | 2.1% |
| Mar 3, 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | High 8.8 | 70% |
| Mar 3, 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | High 8.8 | 45% |
| Mar 3, 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | High 8.8 | 11% |
| Mar 3, 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | High 8.8 | 11% |
| Mar 3, 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | High 8.8 | 11% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.