CVE-2025-27775
Published: 19 March 2025
Summary
CVE-2025-27775 is a high-severity SSRF (CWE-918) vulnerability in Applio Applio. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 14.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Applio, an open-source voice conversion tool, is affected by a server-side request forgery vulnerability combined with an arbitrary file write flaw in versions 3.2.7 and earlier. The issues reside in model_download.py, where untrusted input supplied to download functionality permits outbound requests from the server and uncontrolled writes to the local filesystem.
An unauthenticated remote attacker can trigger the blind SSRF to reach internal network resources or the server itself and can write attacker-controlled files. These primitives may be chained with other weaknesses, such as unsafe deserialization, to obtain remote code execution on the Applio host.
The GitHub Security Lab advisory (GHSL-2024-341) confirms the absence of patches at disclosure and points to the affected code paths in routes.py, model_download.py, and the download tab. The EPSS score has remained low, with a recorded peak of 0.0316 and a current value of 0.0239.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-6787
Vulnerability details
Applio is a voice conversion tool. Versions 3.2.7 and prior are vulnerable to server-side request forgery (SSRF) and file write in `model_download.py` (line 143 in 3.2.7). The blind SSRF allows for sending requests on behalf of Applio server and can…
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be leveraged to probe for other vulnerabilities on the server itself or on other back-end systems on the internal network, that the Applio server can reach. The file write allows for writing files on the server, which can be coupled with other vulnerabilities, for example an unsafe deserialization, to achieve remote code execution on the Applio server. As of time of publication, no known patches are available.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing attempts server-side requests to internal resources, identifying SSRF weaknesses for remediation.
Outbound connections to external resources can be monitored and limited at the boundary, reducing SSRF impact.
Validates server-side URLs and resource references to block SSRF attempts.
Detects server-side request forgery through monitoring of unexpected outbound connections.