Quick answers
- Is CVE-2025-56223 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-56223 being exploited in the wild.
- How severe is CVE-2025-56223?
- High severity, with a CVSS score of 7.5, published 20 October 2025.
- Which products and versions are affected?
- Ascertia Signinghub <= 8.6.8.
- Is there a fix for CVE-2025-56223?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2025-56223 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2025-56223?
- Check whether you run Ascertia Signinghub at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A resource exhaustion vulnerability exists in the SigningHub Upload Document API (/Home/UploadStreamDocument). The component fails to implement rate limiting or throttling on file uploads. A remote attacker can exploit this by rapidly uploading a large volume of files, leading to disk space depletion, high CPU/memory load, and overall service degradation. The vulnerability is confirmed in version 8.6.8 and earlier; remediation involves upgrading to a version later than 8.6.8 or implementing server-side rate limiting.
Affected products
- Ascertia SigningHub <= 8.6.8
Timeline
- 2025-10-20: disclosed
- 2025-10-20: advisory