Improper input validation in Cisco 8831
CVE-2020-3161
A vulnerability in the web server for Cisco IP Phones could allow an unauthenticated, remote attacker to execute code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition. The vulnerability is due to a lack of proper input validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the web server of a targeted device. A successful exploit could allow the attacker to remotely execute code with root privileges or cause a reload of an affected IP phone, resulting in a DoS condition.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.839 (99.7th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.839 · newest: 0.839 · change: 0.000
Affected products
- Cisco 8831
- Cisco 8831 Firmware — versions 10.3\(1\)es14, 11.0(1), 10.3(1)es14
- Cisco Ip Phone
- Cisco Ip Phone 7811
- Cisco Ip Phone 7811 Firmware — versions 11.0(1), 11.0\(1\)
- Cisco Ip Phone 7821
- Cisco Ip Phone 7821 Firmware — versions 11.0(1), 11.0\(1\)
- Cisco Ip Phone 7841
- Cisco Ip Phone 7841 Firmware — versions 11.0(1), 11.0\(1\)
- Cisco Ip Phone 7861
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-pho… (vendor-advisory, Vendor Advisory)
- packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.html (Exploit, VDB Entry, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2020-3161?
- CVE-2020-3161 is a critical-severity vulnerability in Cisco 8831, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-04-15.
- How severe is CVE-2020-3161?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-3161 known to be exploited?
- Yes. CVE-2020-3161 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 8 public proof-of-concept repositories are indexed.