Vulnerability in Cisco Asr-920-12cz-A
CVE-2017-3859
A vulnerability in the DHCP code for the Zero Touch Provisioning feature of Cisco ASR 920 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a format string vulnerability when processing a crafted DHCP packet for Zero Touch Provisioning. An attacker could exploit this vulnerability by sending a specially crafted DHCP packet to an affected device. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. This vulnerability affects Cisco ASR 920 Series Aggregation Services Routers that are running an affected release of Cisco IOS XE Software (3.13 through 3.18) and are listening on the DHCP server port. By default, the devices do not listen on the DHCP server port. Cisco Bug IDs: CSCuy56385.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.025 (83.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000
Affected products
- 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 iOS Xe — versions 3.13.4s, 3.13.5as, 3.13.5s
- Cisco iOS Xe Software For Asr 920 Series Routers — versions Cisco IOS XE Software for Cisco ASR 920 Series Routers
Weakness classification (CWE)
References
- www.securitytracker.com/id/1038104 (vdb-entry)
- www.securityfocus.com/bid/97008 (VDB Entry, Third Party Advisory, vdb-entry)
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170322… (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-3859?
- CVE-2017-3859 is a high-severity vulnerability in Cisco Asr-920-12cz-A, classified under Use of Externally-Controlled Format String. CVSS score: 7.5/10. Published 2017-03-22.
- How severe is CVE-2017-3859?
- High severity. CVSS v3 base score is 7.5 out of 10.