Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0 nfsd out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.3$0-$5k0.33+

Summaryinfo

A vulnerability marked as critical has been reported in Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0. This affects an unknown part of the component nfsd. Performing a manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-18633. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0. This affects an unknown code of the component nfsd. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. The summary by CVE is:

An access of uninitialized pointer vulnerability in the nfsd in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote attackers to conduct denial-of-service attacks.

It is possible to read the advisory at synology.com. This vulnerability is uniquely identified as CVE-2026-18633 since 08/03/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 7.3.2-86009-5 or 7.4.1-90080-1 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (synology): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: DiskStation Manager 7.3.2-86009-5/7.4.1-90080-1

Timelineinfo

08/03/2026 CVE reserved
11/12/2026 +101 days Advisory disclosed
11/12/2026 +0 days VulDB entry created
11/12/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: synology.com

Advisory: synology.com
Status: Confirmed

CNA: synology
CVE: CVE-2026-18633 (🔒)

GCVE (CVE): GCVE-0-2026-18633
GCVE (VulDB): GCVE-100-436251

Entryinfo

Created: 11/12/2026 05:04
Changes: 11/12/2026 05:04 (64)
Complete: 🔍
Cache ID: 216::103

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