CVE-2020-3357

highpriority · track · 40EPSS 0.042 · 91 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

4.24% (91st) EPSS

CVSS 10 · high

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device or cause the device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because HTTP requests are not properly validated. An attacker could exploit this vulnerability by sending a crafted HTTP request over an SSL connection to an affected device. A successful exploit could allow the attacker to remotely execute arbitrary code on the device or cause the device to reload, resulting in a DoS condition.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Small Business RV Series Router Firmwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 9–10

v2.010highAV:N/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 10 · impact 10

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@cisco.com USexploitability 3.9 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

affected products (10)

Products and version ranges known to be affected.

Cisco Cisco Small Business RV Series Router Firmwareall versionscisco_csafUS
Cisco Cisco Small Business RV Series Router Firmware≤ n/aenisa_euvdEU
Cisco Systems Inc. Cisco RV340W≤ 1.0.03.18fstec_bduRU
Cisco Systems Inc. Cisco RV345≤ 1.0.03.18fstec_bduRU
Cisco Systems Inc. Cisco RV345P≤ 1.0.03.18fstec_bduRU
Cisco Systems Inc. Cisco Small Business RV340≤ 1.0.03.18fstec_bduRU
cisco rv340 dual wan gigabit vpn router firmware< 1.0.03.18nvdUScpe:2.3:o:cisco:rv340_dual_wan_gigabit_vpn_router_firmware:*:*:*:*:*:*:*:*
cisco rv340w dual wan gigabit wireless-ac vpn router firmware< 1.0.03.18nvdUScpe:2.3:o:cisco:rv340w_dual_wan_gigabit_wireless-ac_vpn_router_firmware:*:*:*:*:*:*:*:*
cisco rv345 dual wan gigabit vpn router firmware< 1.0.03.18nvdUScpe:2.3:o:cisco:rv345_dual_wan_gigabit_vpn_router_firmware:*:*:*:*:*:*:*:*
cisco rv345p dual wan gigabit poe vpn router firmware< 1.0.03.18nvdUScpe:2.3:o:cisco:rv345p_dual_wan_gigabit_poe_vpn_router_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-sb-rce-dos-9ZAjkx4Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers SSL Remote Code Execution and Denial of Service Vulnerability2020-07-15csaf · cisco_csafUS
A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device or cause the device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because HTTP requests are not properly validated. An attacker could exploit this vulnerability by sending a crafted HTTP request over an SSL connection to an affected device. A successful exploit could allow the attacker to remotely execute arbitrary code on the device or cause the device to reload, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rce-dos-9ZAjkx4 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rce-dos-9ZAjkx4"]

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2020-07-16modified 2026-06-17

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+25188 more

references (6)

External citations — patches, advisories, analysis.

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