CVE-2018-0173 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2022-03-17.
Description
A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.
Scoring
| CVSS | 8.6 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| EPSS | 7.61% — more likely to be exploited than 94% of all CVEs |
| Weakness | CWE-20 |
| On CISA KEV | yes — remediate by 2022-03-17 |
| Public exploit | none known |
| Published | 2018-03-28 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Cisco IOS and IOS XE Software Improper Input Validation Vulnerability |
|---|---|
| Added | 2022-03-03 |
| Due | 2022-03-17 |
| Vendor / product | Cisco / IOS and IOS XE Software |
| Ransomware use | none reported |
Affected (20)
| Vendor | Product |
|---|---|
| cisco | 4321 integrated services router |
| cisco | 4331 integrated services router |
| cisco | 4351 integrated services router |
| cisco | 4431 integrated services router |
| cisco | 4451-x integrated services router |
| cisco | asr 1000 series route processor \(rp2\) |
| cisco | asr 1000 series route processor \(rp3\) |
| cisco | asr 1001-hx |
| cisco | asr 1001-x |
| cisco | asr 1002-hx |
| cisco | asr 1002-x |
| cisco | cloud services router 1000v |
| cisco | ios |
| cisco | ios xe |
| rockwellautomation | allen-bradley armorstratix 5700 |
| rockwellautomation | allen-bradley stratix 5400 |
| rockwellautomation | allen-bradley stratix 5410 |
| rockwellautomation | allen-bradley stratix 5700 |
| rockwellautomation | allen-bradley stratix 8000 |
| rockwellautomation | allen-bradley stratix 8300 |
References
- http://www.securityfocus.com/bid/103545
- http://www.securitytracker.com/id/1040591
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2
- https://www.tenable.com/security/research/tra-2018-06
- http://www.securityfocus.com/bid/103545
- http://www.securitytracker.com/id/1040591
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2
- https://www.tenable.com/security/research/tra-2018-06
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0173
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