CVE-2019-15271 | Cisco Small Business RV016, RV042, RV042G, and RV082 Routers Arbitrary Command Execution Vulnerability

Exp

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.

Published: 2019-11-26 Last update: 2025-10-28 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-15271 is rated Critical Active Threat (91.5/100): CVSS High severity, with high exploitation likelihood (EPSS 5.60%, 90th percentile). CISA KEV confirms active exploitation (added 2022-06-08) affecting Cisco / RV Series Routers. a weakness (CWE-502) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2019-15271

Name: Cisco RV Series Routers Deserialization of Untrusted Data Vulnerability · CISA KEV detail

Exploit added: 2022-06-08

Action due: 2022-06-22

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2019-15271

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-02 5.88% 5.60% -0.28%
2 2025-11-21 4.62% 5.88% +1.26%
3 2025-11-18 — 4.62% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-15271

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2019-15271

Affected software / configurations for CVE-2019-15271

Vendor Product Version Raw CPE
cisco rv016_multi-wan_vpn_firmware < 4.2.3.10 cpe:2.3:o:cisco:rv016_multi-wan_vpn_firmware:*:*:*:*:*:*:*:*
cisco rv042_dual_wan_vpn_firmware < 4.2.3.10 cpe:2.3:o:cisco:rv042_dual_wan_vpn_firmware:*:*:*:*:*:*:*:*
cisco rv042g_dual_gigabit_wan_vpn_firmware < 4.2.3.10 cpe:2.3:o:cisco:rv042g_dual_gigabit_wan_vpn_firmware:*:*:*:*:*:*:*:*
cisco rv082_dual_wan_vpn_firmware < 4.2.3.10 cpe:2.3:o:cisco:rv082_dual_wan_vpn_firmware:*:*:*:*:*:*:*:*

References for CVE-2019-15271

cvelogic Threat Intelligence