CVE-2020-5548

Yamaha LTE VoIP Router(NVR700W firmware Rev.15.00.15 and earlier), Yamaha Gigabit VoIP Router(NVR510 firmware Rev.15.01.14 and earlier), Yamaha Gigabit VPN Router(RTX810 firmware Rev.11.01.33 and earlier, RTX830 firmware Rev.15.02.09 and earlier, RTX1200 firmware Rev.10.01.76 and earlier, RTX1210 firmware Rev.14.01.33 and earlier, RTX3500 firmware Rev.14.00.26 and earlier, and RTX5000 firmware Rev.14.00.26 and earlier), Yamaha Broadband VoIP Router(NVR500 firmware Rev.11.00.38 and earlier), and Yamaha Firewall(FWX120 firmware Rev.11.03.27 and earlier) allow remote attackers to cause a denial of service via unspecified vectors.

Published: 2020-04-01 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-5548 is rated Moderate Risk (58.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.32%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2020-5548

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 2025-11-21 0.86% 1.32% +0.47%
2 2025-11-18 1.32% 0.86% -0.47%
3 2025-06-21 — 1.32% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-5548

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/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:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2020-5548

Affected software / configurations for CVE-2020-5548

Vendor Product Version Raw CPE
yamaha rtx830_firmware <= 15.02.09 cpe:2.3:o:yamaha:rtx830_firmware:*:*:*:*:*:*:*:*
yamaha nvr510_firmware <= 15.01.14 cpe:2.3:o:yamaha:nvr510_firmware:*:*:*:*:*:*:*:*
yamaha nvr700w_firmware <= 15.00.15 cpe:2.3:o:yamaha:nvr700w_firmware:*:*:*:*:*:*:*:*
yamaha rtx1210_firmware <= 14.01.33 cpe:2.3:o:yamaha:rtx1210_firmware:*:*:*:*:*:*:*:*
yamaha rtx5000_firmware <= 14.00.26 cpe:2.3:o:yamaha:rtx5000_firmware:*:*:*:*:*:*:*:*
yamaha rtx3500_firmware <= 14.00.26 cpe:2.3:o:yamaha:rtx3500_firmware:*:*:*:*:*:*:*:*
yamaha fwx120_firmware <= 11.03.27 cpe:2.3:o:yamaha:fwx120_firmware:*:*:*:*:*:*:*:*
yamaha rtx810_firmware <= 11.01.33 cpe:2.3:o:yamaha:rtx810_firmware:*:*:*:*:*:*:*:*
yamaha nvr500_firmware <= 11.00.38 cpe:2.3:o:yamaha:nvr500_firmware:*:*:*:*:*:*:*:*
yamaha rtx1200_firmware <= 10.01.76 cpe:2.3:o:yamaha:rtx1200_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-5548

cvelogic Threat Intelligence