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CVE-2020-5548

24
FAUCET Score

CVE-2020-5548 describes a denial-of-service vulnerability affecting various Yamaha LTE VoIP, Gigabit VoIP, Gigabit VPN, Broadband VoIP Routers, and Firewall devices running specific firmware versions. The vulnerability allows remote attackers to cause a denial of service through unspecified vectors. With a CVSS score of 7.5 (High), it can be exploited over the network with low attack complexity, requiring no user interaction or privileges, leading to high availability impact. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 15.02.09CPE matchmatch criteria
cpe:2.3:o:yamaha:rtx830_firmware:*:*:*:*:*:*:*:*
<= 15.01.14CPE matchmatch criteria
cpe:2.3:o:yamaha:nvr510_firmware:*:*:*:*:*:*:*:*
<= 15.00.15CPE matchmatch criteria
cpe:2.3:o:yamaha:nvr700w_firmware:*:*:*:*:*:*:*:*
<= 14.01.33CPE matchmatch criteria
cpe:2.3:o:yamaha:rtx1210_firmware:*:*:*:*:*:*:*:*
<= 14.00.26CPE matchmatch criteria
cpe:2.3:o:yamaha:rtx5000_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.42%
Probability of exploitation in next 30 days
EPSS Percentile
70.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0142 is in the 51st percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jvn.jp / en/jp/JVN38732359/index.html
Third Party Advisory
rtpro.yamaha.co.jp / RT/FAQ/Security/JVN38732359.html
MitigationVendor Advisory