Critical severity9.8NVD Advisory· Published Oct 21, 2021· Updated Jun 17, 2026
CVE-2020-27304
CVE-2020-27304
Description
The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
51.8+ 2 more
- (no CPE)range: 1.8
- (no CPE)
- cpe:2.3:a:civetweb_project:civetweb:*:*:*:*:*:*:*:*range: >=1.8,<1.15
- cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*Range: <1.0.1.1
Patches
Vulnerability mechanics
References
4- cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfnvdPatchThird Party Advisory
- jfrog.com/blog/cve-2020-27304-rce-via-directory-traversal-in-civetweb-http-server/nvdExploitThird Party Advisory
- groups.google.com/g/civetweb/c/yPBxNXdGgJQnvdMailing ListThird Party Advisory
- cert-portal.siemens.com/productcert/pdf/ssa-222547.pdfnvd
News mentions
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