What is CVE-2023-5746?

CVE-2023-5746 is a critical-severity vulnerability in Synology Bc500, classified under Use of Externally-Controlled Format String. CVSS score: 9.8/10. Published 2023-10-25.

How severe is CVE-2023-5746?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Synology Bc500

CVE-2023-5746

A vulnerability regarding use of externally-controlled format string is found in the cgi component. This allows remote attackers to execute arbitrary code via unspecified vectors. The following models with Synology Camera Firmware versions before 1.0.5-0185 may be affected: BC500 and TC500.

Published 2023-10-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

References

www.synology.com/en-global/security/advisory/Synology_SA_23_11 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-5746?: CVE-2023-5746 is a critical-severity vulnerability in Synology Bc500, classified under Use of Externally-Controlled Format String. CVSS score: 9.8/10. Published 2023-10-25.
How severe is CVE-2023-5746?: Critical severity. CVSS v3 base score is 9.8 out of 10.