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CVE-2019-15271: Cisco RV Series Routers Deserialization of Untrusted Data Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-06-08
• EPSS: 5.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-11-26 · updated 2026-06-17
• Weakness: CWE-502

Description

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.

Affected products

• Cisco Rv016 Multi-Wan Vpn Firmware: before 4.2.3.10 — fixed in 4.2.3.10
• Cisco Rv042 Dual Wan Vpn Firmware: before 4.2.3.10 — fixed in 4.2.3.10
• Cisco Rv042G Dual Gigabit Wan Vpn Firmware: before 4.2.3.10 — fixed in 4.2.3.10
• Cisco Rv082 Dual Wan Vpn Firmware: before 4.2.3.10 — fixed in 4.2.3.10

How to fix

Upgrade to a fixed version: Cisco Rv016 Multi-Wan Vpn Firmware 4.2.3.10; Cisco Rv042 Dual Wan Vpn Firmware 4.2.3.10; Cisco Rv042G Dual Gigabit Wan Vpn Firmware 4.2.3.10; Cisco Rv082 Dual Wan Vpn Firmware 4.2.3.10. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-sbrv-cmd-x
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-sbrv-cmd-x
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-15271

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