Synology
Synology Diskstation Manager Unified Controller: vulnerabilities and CVEs
Synology Diskstation Manager Unified Controller has 20 published vulnerabilities, 3 of them in the last 12 months. 4 are rated critical and 1 are listed by CISA as actively exploited.
CVEs20
Last 12 months3
Critical4
Actively exploited1
All vulnerabilities in the catalogue →⭐ Follow this technology
🔴 Actively exploited (CISA KEV)
| CVE | Severity | EPSS | Active exploitation | Published | Description |
|---|---|---|---|---|---|
| CVE-2021-3156 | High (7.8) | 100% | ⚠ Active exploitation | Jan 26, 2021 | Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash… |
Latest vulnerabilities
| CVE | Severity | EPSS | Active exploitation | Published | Description |
|---|---|---|---|---|---|
| CVE-2024-5401 | High (8.8) | 0.38% | — | Dec 4, 2025 | Improper control of dynamically-managed code resources vulnerability in WebAPI component in Synology DiskStation Manager (DSM) before 7.1.1-42962-8 and 7.2.1-69057-2 and 7.2.2-72806 and Synology Unified Controller… |
| CVE-2024-45539 | High (7.5) | 0.48% | — | Dec 4, 2025 | Out-of-bounds write vulnerability in cgi components in Synology DiskStation Manager (DSM) before 7.2.1-69057-2 and 7.2.2-72806 and Synology Unified Controller (DSMUC) before 3.1.4-23079 allows remote attackers to… |
| CVE-2024-45538 | Critical (9.6) | 0.37% | — | Dec 4, 2025 | Cross-Site Request Forgery (CSRF) vulnerability in WebAPI Framework in Synology DiskStation Manager (DSM) before 7.2.1-69057-2 and 7.2.2-72806 and Synology Unified Controller (DSMUC) before 3.1.4-23079 allows remote… |
| CVE-2023-2729 | High (7.5) | 0.88% | — | Jun 13, 2023 | Use of insufficiently random values vulnerability in User Management Functionality in Synology DiskStation Manager (DSM) before 7.2-64561 allows remote attackers to obtain user credential via unspecified vectors. |
| CVE-2023-0142 | High (8.1) | 0.97% | — | Jun 13, 2023 | Uncontrolled search path element vulnerability in Backup Management functionality in Synology DiskStation Manager (DSM) before 6.2.4-25556-8, 7.0.1-42218-7 and 7.1-42661 allows remote authenticated users with… |
| CVE-2022-22687 | Critical (9.8) | 2.4% | — | Mar 25, 2022 | Buffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in Authentication functionality in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute… |
| CVE-2021-29087 | High (7.5) | 1.4% | — | Jun 23, 2021 | Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in webapi component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to write arbitrary… |
| CVE-2021-29086 | High (7.5) | 1.2% | — | Jun 23, 2021 | Exposure of sensitive information to an unauthorized actor vulnerability in webapi component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to obtain sensitive information via… |
| CVE-2021-29085 | High (7.5) | 1.3% | — | Jun 23, 2021 | Improper neutralization of special elements in output used by a downstream component ('Injection') vulnerability in file sharing management component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows… |
| CVE-2021-29084 | High (7.5) | 1.3% | — | Jun 23, 2021 | Improper neutralization of special elements in output used by a downstream component ('Injection') vulnerability in Security Advisor report management component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3… |
| CVE-2021-27649 | Critical (9.8) | 2.0% | — | Jun 23, 2021 | Use after free vulnerability in file transfer protocol component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via unspecified vectors. |
| CVE-2021-26567 | High (7.8) | 1.1% | — | Feb 26, 2021 | Stack-based buffer overflow vulnerability in frontend/main.c in faad2 before 2.2.7.1 allow local attackers to execute arbitrary code via filename and pathname options. |
| CVE-2021-26566 | Critical (9) | 1.5% | — | Feb 26, 2021 | Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound… |
| CVE-2021-26565 | Medium (5.9) | 0.74% | — | Feb 26, 2021 | Cleartext transmission of sensitive information vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to obtain sensitive information via an HTTP… |
| CVE-2021-26564 | High (8.7) | 0.67% | — | Feb 26, 2021 | Cleartext transmission of sensitive information vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to spoof servers via an HTTP session. |
| CVE-2021-26563 | Medium (6.7) | 0.51% | — | Feb 26, 2021 | Incorrect authorization vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.4-25553 allows local users to execute arbitrary code via unspecified vectors. |
| CVE-2021-26562 | High (8.1) | 1.9% | — | Feb 26, 2021 | Out-of-bounds write vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary code via syno_finder_site HTTP header. |
| CVE-2021-26561 | High (8.1) | 2.1% | — | Feb 26, 2021 | Stack-based buffer overflow vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary code via syno_finder_site HTTP header. |
| CVE-2021-26560 | High (7.4) | 0.77% | — | Feb 26, 2021 | Cleartext transmission of sensitive information vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to spoof servers via an HTTP session. |
| CVE-2021-3156 | High (7.8) | 100% | ⚠ Active exploitation | Jan 26, 2021 | Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash… |
🎯 How it gets exploited (ATT&CK techniques)
Number of CVEs of this technology mapped to each exploitation or primary-impact technique.