CVE-2017-9553 — A design flaw in SYNO

A design flaw in SYNO.API.Encryption in Synology DiskStation Manager (DSM) before 6.1.3-15152 allows remote attackers to bypass the encryption protection mechanism via the crafted version parameter.

01What is this vulnerability?

A design flaw in SYNO.API.Encryption in Synology DiskStation Manager (DSM) before 6.1.3-15152 allows remote attackers to bypass the encryption protection mechanism via the crafted version parameter.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-07-24T20:29:00.217
• Last modified: 2026-05-13T00:24:29.033

09References

• www.2-sec.com — https://www.2-sec.com/2017/06/2-secs-expert-team-uncovers-new-vulnerability-popu…
• www.synology.com — https://www.synology.com/en-global/support/security/Synology_SA_17_29_DSM
• www.2-sec.com — https://www.2-sec.com/2017/06/2-secs-expert-team-uncovers-new-vulnerability-popu…
• www.synology.com — https://www.synology.com/en-global/support/security/Synology_SA_17_29_DSM