CVE-2025-27776
Published: 19 March 2025
Summary
CVE-2025-27776 is a high-severity SSRF (CWE-918) vulnerability in Applio Applio. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 14.9% 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 arbitrary file write in versions 3.2.7 and earlier. The issues reside in model_download.py at line 240 and are reachable through the Flask routes that handle model downloads. The blind SSRF permits outbound requests from the Applio server, while the file-write primitive permits creation of arbitrary files on the host filesystem; both are tracked under CWE-918.
An unauthenticated remote attacker can supply crafted inputs to trigger these primitives. The SSRF can be used to scan or interact with internal services reachable by the Applio host, and when paired with the related arbitrary-file-read issue CVE-2025-27784 it becomes a full SSRF capable of retrieving internal content. The file-write capability can further be chained with other flaws such as unsafe deserialization to obtain remote code execution on the Applio server.
Public references, including the GitHub Security Lab advisory GHSL-2024-341, confirm that no patches were available at the time of disclosure. The listed code locations in routes.py, model_download.py, and download.py illustrate the affected request-handling paths, and administrators are advised to restrict network egress and input sources until fixes are released.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-6788
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 240 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 blind SSRF can also be coupled with the arbitrary file read 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.