Security Resilience

CVE-2023-5746

Synology Bc500 Firmware ≤ 1.0.5-0185

Published
25 October 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.017 77th percentile
Risk Priority 78 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-5746 is a critical-severity Use of Externally-Controlled Format String (CWE-134) vulnerability in Synology Bc500 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique LSASS Memory (T1003.001); ranked in the top 23% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

A format string vulnerability exists in the CGI component of Synology Camera Firmware versions prior to 1.0.5-0185, affecting the BC500 and TC500 camera models. Tracked as CVE-2023-5746 and assigned CWE-134, the flaw stems from the use of externally controlled format strings and carries a CVSS 3.1 score of 9.8.

Unauthenticated remote attackers can exploit the issue over the network with no user interaction required, enabling arbitrary code execution that fully compromises confidentiality, integrity, and availability of the affected devices.

The official Synology advisory Synology_SA_23_11 recommends updating the firmware to version 1.0.5-0185 or later to address the vulnerability. The associated EPSS score has remained flat at 0.0589 with no material increase observed since disclosure.

EU & UK References

Vulnerability Data

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…

more

TC500.

CWE(s)
CWE-134

Related Threats

MITRE ATT&CK Enterprise Techniques

T1003.001 LSASS Memory Credential Access
Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
attack.mitre.org →
T1003.002 Security Account Manager Credential Access
Adversaries may attempt to extract credential material from the Security Account Manager (SAM) database either through in-memory techniques or through the Windows Registry where the SAM database is stored.
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.007 Proc Filesystem Credential Access
Adversaries may gather credentials from the proc filesystem or `/proc`.
attack.mitre.org →
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
T1016 System Network Configuration Discovery Discovery
Adversaries may look for details about the network configuration and settings, such as IP and/or MAC addresses, of systems they access or through information discovery of remote systems.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-39349Same product: Synology Bc500
CVE-2024-5463Same product: Synology Bc500
CVE-2023-47803Same product: Synology Bc500
CVE-2024-39350Same product: Synology Bc500
CVE-2024-39351Same product: Synology Bc500
CVE-2023-47802Same product: Synology Bc500
CVE-2024-39352Same product: Synology Bc500
CVE-2024-11131Same product: Synology Bc500
CVE-2024-50400Same product class: NAS / storage appliance
CVE-2024-50397Same product class: NAS / storage appliance

Affected Assets

synology
bc500 firmware
≤ 1.0.5-0185
synology
tc500 firmware
≤ 1.0.5-0185

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

ID.RA-01 partial match
blocks

Vulnerability identification can discover existing format-string flaws but does not prevent their introduction.

PR.PS-06 partial match
blocks

Secure SDLC practices directly prevent external format strings via code review, static analysis, and safe APIs.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

References