CVE-2019-15271

Cisco RV Series Routers Deserialization of Untrusted Data

8.8 HIGHActively exploited (CISA KEV)EPSS 5.49%

Published26 Nov 2019
Added to CISA KEV8 Jun 2022
Remediation due22 Jun 2022

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

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

Remediation

Fixed in

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

Patch & vendor advisories

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-sbrv-cmd-x

References

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

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2019-15271 being actively exploited?

Yes. CVE-2019-15271 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 8 Jun 2022.

How severe is CVE-2019-15271?

CVE-2019-15271 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 5.49% probability of exploitation.

Which products are affected by CVE-2019-15271?

Affected products include Cisco Rv016 Multi-wan VPN Firmware, Cisco Rv042 Dual Wan VPN Firmware, Cisco Rv042g Dual Gigabit Wan VPN Firmware, Cisco Rv082 Dual Wan VPN Firmware.

How do I fix CVE-2019-15271?

Upgrade affected software to a fixed version, for example 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 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2019-15271 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.