← Vulnerability feed

Vulnerability record · CVE-2021-29087 · published 23 June 2021

CVE-2021-29087: Synology diskstation manager path traversal vulnerability

Synology · Diskstation Manager

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 files via unspecified vectors.

7.5 CVSS 3.1 High EPSS 1.4% · top 28.5% CWE-22 · Path traversal
7.5CVSS 3.1 base score, v2 5.0
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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 files via unspecified vectors.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.synology.com/security/advisory/Synology_SA_20_26 Vendor Advisory
https://www.synology.com/security/advisory/Synology_SA_20_26 Vendor Advisory

Track CVE-2021-29087 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2021-3156Sudo off-by-one heap overflow allows root privilege escalationSudo before 1.9.5p2 contains an off-by-one error leading to a heap-based buffer overflow. Triggering it via 'sudoedit -s' with a command-line argumen…KEVEPSS 100%analysed10.0CVE-2013-6955Synology DSM imageSelector.cgi arbitrary file append and code executionSynology DiskStation Manager (DSM) versions 4.0 before 4.0-2259, 4.2 before 4.2-3243, and 4.3 before 4.3-3810 Update 1 contain a flaw in webman/image…EPSS 85%analysed9.8CVE-2025-13392Synology diskstation manager vulnerabilityImproper check for unusual or exceptional conditions vulnerability in SSO in Synology DiskStation Manager (DSM) before 7.2.2-72806-5 and 7.3.1-86003-…EPSS 0.53%9.8CVE-2024-10441Synology beestation os vulnerabilityImproper encoding or escaping of output vulnerability in the system plugin daemon in Synology BeeStation OS (BSM) before 1.1-65374 and Synology DiskS…EPSS 1.2%9.8CVE-2022-27625Synology diskstation manager memory buffer overflow vulnerabilityA vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the message processing functionality of…EPSS 1.6%9.8CVE-2022-27624Synology diskstation manager memory buffer overflow vulnerabilityA vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the packet decryption functionality of …EPSS 1.6%9.8CVE-2022-22687Synology diskstation manager classic buffer overflow vulnerabilityBuffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in Authentication functionality in Synology DiskStation Manager …EPSS 2.4%9.8CVE-2021-43927Synology diskstation manager sql injection vulnerabilityImproper neutralization of special elements used in an SQL command ('SQL Injection') vulnerability in Security Management functionality in Synology D…EPSS 0.88%

Source: NIST National Vulnerability Database (record CVE-2021-29087), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.