Synology DiskStation Manager up to 6.2.3-25423 HTTP Header syno_finder_site stack-based overflow

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.3	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Synology DiskStation Manager. This issue affects some unknown processing of the component HTTP Header Handler. This manipulation of the argument syno_finder_site causes stack-based overflow. This vulnerability is registered as CVE-2021-26561. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Synology DiskStation Manager (Network Attached Storage Software). Affected by this vulnerability is some unknown functionality of the component HTTP Header Handler. The manipulation of the argument syno_finder_site with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 02/27/2021 as SA_20_26. It is possible to read the advisory at synology.com. This vulnerability is known as CVE-2021-26561. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.2.3-25426-3 eliminates this vulnerability.

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

Productinfo

Type

Network Attached Storage Software

Vendor

Synology

Name

DiskStation Manager

Version

License

commercial

Website

Vendor: https://www.synology.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 8.3

VulDB Base Score: 8.1
VulDB Temp Score: 7.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔍

CNA Base Score: 9.0
CNA Vector (Synology Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: DiskStation Manager 6.2.3-25426-3

Timelineinfo

02/02/2021 🔍
02/27/2021 +25 days 🔍
02/27/2021 +0 days 🔍
01/15/2025 +1418 days 🔍

Sourcesinfo

Vendor: synology.com

Advisory: SA_20_26
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-26561 (🔍)
GCVE (CVE): GCVE-0-2021-26561
GCVE (VulDB): GCVE-100-170515

Entryinfo

Created: 02/27/2021 08:15
Updated: 01/15/2025 07:16
Changes: 02/27/2021 08:15 (40), 03/05/2021 20:43 (6), 03/05/2021 20:48 (1), 03/14/2021 07:04 (16), 01/15/2025 07:16 (27)
Complete: 🔍
Cache ID: 216::103