Analyst readout for executives and security teams
Plain-English summary
CVE-2022-27615 is a path traversal flaw in Synology DNS Server. An authenticated remote user could delete arbitrary files through the CGI component. The main business risk is service disruption or system damage on affected Synology systems running versions before 2.2.2-5027.
Executive priority
Treat this as a high-priority remediation for any production Synology DNS Server deployment below 2.2.2-5027. It is not confirmed as actively exploited in the supplied evidence, but arbitrary file deletion can create material outage risk.
Technical view
The vulnerability is CWE-22 in Synology DNS Server CGI handling. CVSS 3.1 is 7.7 with network access, low privileges, no user interaction, changed scope, and high availability impact. Public details say the attack vector is unspecified, so validation should focus on version exposure, access paths, and vendor advisory alignment.
Likely exposure
Exposure is limited to organizations running Synology DNS Server before 2.2.2-5027. Risk increases where low-privileged or broadly shared authenticated accounts can reach the DNS Server CGI interface over the network.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV in the supplied bundle. The vulnerability requires authentication, but low privileges are enough according to the CVSS vector.
Researcher notes
The public bundle does not specify the vulnerable CGI endpoint, file path constraints, proof of concept, or exploit chain. Avoid assuming broader Synology product impact beyond DNS Server before 2.2.2-5027 unless confirmed by Synology.
Mitigation direction
- Upgrade Synology DNS Server to 2.2.2-5027 or later where available.
- Review Synology advisory Synology_SA_20_27 for exact package and platform guidance.
- Restrict DNS Server administrative access to trusted networks and users.
- Remove unnecessary low-privileged accounts that can access DNS Server management surfaces.
- Monitor affected systems for unexpected file deletion or service instability.
Validation and detection
- Inventory Synology NAS systems running the DNS Server package.
- Confirm each DNS Server package version is 2.2.2-5027 or later.
- Identify authenticated users who can reach DNS Server CGI management functions.
- Check whether DNS Server management access is exposed beyond trusted networks.
- Review logs for unusual authenticated DNS Server management activity.
Public sources used
Based on public source material and reviewed before publication.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2022-27615 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H3.14Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.7HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_20_27CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.