TOTOLINK CA600-PoE 5.3c.6665_B20180820 CloudSrvUserdataVersionCheck svn command injection

Summaryinfo

A vulnerability was found in TOTOLINK CA600-PoE 5.3c.6665_B20180820. It has been classified as critical. This vulnerability affects the function CloudSrvUserdataVersionCheck. This manipulation of the argument svn causes command injection. This vulnerability appears as CVE-2025-44840. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in TOTOLINK CA600-PoE 5.3c.6665_B20180820. It has been declared as critical. Affected by this vulnerability is the function CloudSrvUserdataVersionCheck. The manipulation of the argument svn with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

TOTOLINK CA600-PoE V5.3c.6665_B20180820 was found to contain a command injection vulnerability in the CloudSrvUserdataVersionCheck function via the svn parameter. This vulnerability allows attackers to execute arbitrary commands via a crafted request.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-44840 since 04/22/2025. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/26/2025). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-12837). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• TOTOLINK

Name

• CA600-PoE

Version

• 5.3c.6665_B20180820

License

• commercial

Website

• Vendor: https://www.totolink.net/

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

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