Quest Coexistence Manager for Notes 3.8.2045 Busy Connector request smuggling

Summaryinfo

A vulnerability was found in Quest Coexistence Manager for Notes 3.8.2045. It has been rated as critical. This vulnerability affects unknown code of the component Busy Connector Module. Performing a manipulation results in request smuggling. This vulnerability is cataloged as CVE-2025-12874. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Quest Coexistence Manager for Notes 3.8.2045. It has been classified as critical. This affects an unknown function of the component Busy Connector Module. The manipulation with an unknown input leads to a request smuggling vulnerability. CWE is classifying the issue as CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Quest Coexistence Manager for Notes (Free/Busy Connector modules) allows HTTP Request Smuggling via the Content-Length-Transfer-Encoding (CL.TE) attack vector. This could allow an attacker to bypass access controls, poison web caches, hijack sessions, or trigger unintended internal requests. This issue affects Coexistence Manager for Notes 3.8.2045. Other versions may also be affected.

The weakness was shared by Cam Lischke. It is possible to read the advisory at support.quest.com. This vulnerability is uniquely identified as CVE-2025-12874 since 11/07/2025. 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. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/19/2025).

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

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Productinfo

Vendor

• Quest

Name

• Coexistence Manager for Notes

Version

• 3.8.2045

License

• commercial

Website

• Vendor: https://www.quest.com/

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