CVE-2025-27774
Published: 19 March 2025
Summary
CVE-2025-27774 is a high-severity SSRF (CWE-918) vulnerability in Applio Applio. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 17.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Applio, an open-source voice conversion tool, contains 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 at the model download handling logic, where untrusted input is passed to network requests and file operations without adequate validation or restrictions.
An unauthenticated remote attacker can supply crafted inputs to trigger blind SSRF requests originating from the Applio server, enabling internal network reconnaissance or, when paired with a separate arbitrary file read issue such as CVE-2025-27784, direct access to internal resources. The accompanying file write primitive can be chained with other weaknesses, for example unsafe deserialization, to achieve remote code execution on the server.
Public references, including the GitHub Security Lab advisory GHSL-2024-341, confirm that no patches have been released for the affected code paths in routes.py, model_download.py, or the download tab handler. The EPSS score remains low with only minor fluctuation between its current value of 0.0173 and recorded peak of 0.0224.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-6786
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 156 in 3.2.7). The blind SSRF allows for sending requests on behalf of Applio server and can…
more
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 blind SSRF can also be coupled with the an arbitrary file read (e.g., CVE-2025-27784) to read files from hosts on the internal network, that the Applio server can reach, which would make it a full SSRF. 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.