CVE-2020-27304

moderate-risk
Published 2021-10-21

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

Do I need to act?

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1.00% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (2)

Civetweb

Affected Vendors

Siemens Civetweb Project

References (8)

https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Mailing List https://groups.google.com/g/civetweb/c/yPBxNXdGgJQ
Exploit https://jfrog.com/blog/cve-2020-27304-rce-via-directory-traversal-in-civetweb-ht...
https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Mailing List https://groups.google.com/g/civetweb/c/yPBxNXdGgJQ
Exploit https://jfrog.com/blog/cve-2020-27304-rce-via-directory-traversal-in-civetweb-ht...
42
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 3/34 · Minimal
Exposure 7/34 · Low