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TI-2021-01247 Aliases CVE-2021-1520GHSA-4vxg-6hgq-qr48

Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Local Privilege Escalation Vulnerability

Priority LOW 31CWE-123Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A vulnerability in the internal message processing of Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an authenticated, local attacker to run arbitrary commands with root privileges on the underlying operating system (OS). This vulnerability exists because an internal messaging service does not properly sanitize input. An attacker could exploit this vulnerability by first authenticating to the device and then sending a crafted request to the internal service. A successful exploit could allow the attacker to run arbitrary commands with root privileges on the underlying OS. To exploit this vulnerability, the attacker must have valid Administrator credentials for the device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0029 21st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Small Business RV Series Router Firmwareall versions—No fix listedCNA
  • Cisco Small Business RV Series Router Firmware VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:cisco:rv340_firmware:*:*:*:*:*:*:*:*before 1.0.03.21VulnerableCisco
cpe:2.3:h:cisco:rv340:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:rv340w_firmware:*:*:*:*:*:*:*:*before 1.0.03.21VulnerableCisco
cpe:2.3:h:cisco:rv340w:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:rv345_firmware:*:*:*:*:*:*:*:*before 1.0.03.21VulnerableCisco
cpe:2.3:h:cisco:rv345:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:rv345p_firmware:*:*:*:*:*:*:*:*before 1.0.03.21VulnerableCisco
cpe:2.3:h:cisco:rv345p:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
  • cpe:2.3:o:cisco:rv340_firmware:*:*:*:*:*:*:*:* Versions before 1.0.03.21 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:rv340:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:rv340w_firmware:*:*:*:*:*:*:*:* Versions before 1.0.03.21 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:rv340w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:rv345_firmware:*:*:*:*:*:*:*:* Versions before 1.0.03.21 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:rv345:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:rv345p_firmware:*:*:*:*:*:*:*:* Versions before 1.0.03.21 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:rv345p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-1520
  2. 2026-10-03 Alias added: GHSA-4vxg-6hgq-qr48

References

Advisory 1

  • TI-2025-23504 Erlang/OTP SSH Vulnerable to Pre-Authentication RCE KEVCVSS 3.1CRITICAL 10.0
  • TI-2022-05267 Cisco Small Business RV Series Routers Vulnerabilities KEVCVSS 3.1CRITICAL 10.0
  • TI-2022-05262 Cisco Small Business RV Series Routers Vulnerabilities KEVCVSS 3.1CRITICAL 10.0
  • TI-2022-05260 Cisco Small Business RV Series Routers Vulnerabilities KEVCVSS 3.1CRITICAL 10.0
  • TI-2022-05259 Cisco Small Business RV Series Routers Vulnerabilities KEVCVSS 3.1CRITICAL 10.0
  • TI-2022-05258 Cisco Small Business RV Series Routers Vulnerabilities KEVCVSS 3.1CRITICAL 10.0
See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences