AEGLIX vulnerability intelligence
CVE-2018-0173
HIGH · CVSS 8.6 · Analyzed
Published: 2018-03-28 · Updated: 2026-06-17 · Source: NVD
Vulnerability overview
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.
Severity and scoring
- CVSS score
- 8.6 · HIGH
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Weaknesses
- CWE-20
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- Cisco · IOS and IOS XE Software
- Added to catalog
- 2022-03-03
- Required action
- Apply updates per vendor instructions.
- CISA remediation due date
- 2022-03-17
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:o:cisco:ios:denali-16.3.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:denali-16.3.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
Through (inclusive): 15.2\(6\)e0a
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
Through (inclusive): 15.2\(6\)e0a
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
Through (inclusive): 15.2\(4a\)ea5
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
Through (inclusive): 15.2\(4a\)ea5
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- http://www.securityfocus.com/bid/103545
Broken Link · Third Party Advisory · VDB Entry
- http://www.securitytracker.com/id/1040591
Broken Link · Third Party Advisory · VDB Entry
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
Third Party Advisory · US Government Resource
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
Third Party Advisory · US Government Resource
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2
Vendor Advisory
- https://www.tenable.com/security/research/tra-2018-06
Third Party Advisory
- http://www.securityfocus.com/bid/103545
Broken Link · Third Party Advisory · VDB Entry
- http://www.securitytracker.com/id/1040591
Broken Link · Third Party Advisory · VDB Entry
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
Third Party Advisory · US Government Resource
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
Third Party Advisory · US Government Resource
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2
Vendor Advisory
- https://www.tenable.com/security/research/tra-2018-06
Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0173
US Government Resource