CVE-2018-0173
Confirmed PUBLISHEDA vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Mar 28, 2018
- Exploitation Reported
- Mar 03, 2022
- CVSS
- 8.6 High
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| n/a |
Cisco IOS and IOS XE
|
Cisco IOS and IOS XE |
Affected |
CVE References
- 103545 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/103545
- 1040591 securitytracker.com · VDB Entry http://www.securitytracker.com/id/1040591
- tools.cisco.com/security/center/content/CiscoSecurityAdvisor... tools.cisco.com · CVE Record https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory...
- ics-cert.us-cert.gov/advisories/ICSA-18-107-04 ics-cert.us-cert.gov · CVE Record https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- tenable.com/security/research/tra-2018-06 tenable.com · CVE Record https://www.tenable.com/security/research/tra-2018-06
Show 1 more reference
- ics-cert.us-cert.gov/advisories/ICSA-18-107-05 ics-cert.us-cert.gov · CVE Record https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-03-03 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:C
Exploitation Status
Exploited in the wild
Recorded 2022-03-03 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Improper Input Validation
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
22:00 UTC over 8 years ago22:00 UTC · over 8 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 8 years ago00:00 UTC · over 8 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2018-0173
{
"cve_id": "CVE-2018-0173",
"title": "A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function ...",
"affected_vendor": "Cisco",
"affected_product": "Cisco IOS and IOS XE",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 8.6,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}