Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 83.7%; technical severity is CVSS 9.8.
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.
Who should care
- Teams operating 8831 Firmware, Cisco IP Phones, Ip Phone 7811 Firmware +11 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether 8831 Firmware, Cisco IP Phones, Ip Phone 7811 Firmware +11 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Cisco Security advisory Cisco Sa Voip Phones Rce Dos RB6EeRXs
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-20
- Affected versions
- Cisco 8831 Firmware (Version 10.3(1)es14 | Version 11.0(1) | Version 11.0(5)sr1); Cisco Cisco IP Phones; Cisco Ip Phone 7811 Firmware (Version 11.0(1)); Cisco Ip Phone 7821 Firmware (Version 11.0(1)); Cisco Ip Phone 7841 Firmware (Version 11.0(1)); Cisco Ip Phone 7861 Firmware (Version 11.0(1)); Cisco Ip Phone 8811 Firmware (Version 10.3(1)es14 | Version 11.0(1) | Version 11.0(5)sr1); Cisco Ip Phone 8821 Firmware (Version 10.3(1)es14 | Version 11.0(1) | Version 11.0(5)sr1)
- Fixed versions
- No explicit fixed version is currently recorded.
- Published
- 15 April 2020
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 83.7%
- Signal calculated at 83