CVE-2019-15271
Cisco RV Series Routers Deserialization of Untrusted Data Vulnerability
Cisco RV Series Routers
A vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an authenticated, remote attacker to execute arbitrary commands with root privileges. The attacker must have either a valid credential or an active session token. The vulnerability is due to lack of input validation of the HTTP payload. An attacker could exploit this vulnerability by sending a malicious HTTP request to the web-based management interface of the targeted device. A successful exploit could allow the attacker to execute commands with root privileges.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 8 June 2022. US federal agencies were required to remediate it by 22 June 2022.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 5.5%, which is higher than 92.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2019-15271 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2019-15271.
What does CVE-2019-15271 affect?
CVE-2019-15271 affects Cisco RV Series Routers. A vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an authenticated, remote attacker to execute arbitrary commands with root privileges. The attacker must have either a valid credential or an active session token. The vulnerability is due to lack of input validation of the HTTP payload. An attacker could exploit this vulnerability by sending a malicious HTTP request to the web-based management interface of the targeted device. A successful exploit could allow the attacker to execute commands with root privileges.
How severe is CVE-2019-15271?
CVE-2019-15271 is rated HIGH with a CVSS base score of 8.8. EPSS puts the probability of exploitation in the next 30 days at 5.5%, higher than 92.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 22 June 2022.
How should organisations respond to CVE-2019-15271?
Apply the vendor patch for Cisco RV Series Routers as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.