Skip to main content
No exploitation reportedFix available

CVE-2020-27304

No exploitation reported by the sources we read.

  • Published2021-10-21
  • Fixed in1.15
  • WeaknessCWE-22 · CWE-23

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC
  1. 2021-10-2116:15CVE publishedNVD

Versions per branch

NVD
Civetweb project civetweb
BranchAffectedFixed in
1.x≥ 1.8, < 1.151.15
Siemens sinec infrastructure network services
BranchAffectedFixed in
1.0< 1.0.1.11.0.1.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cephAzure Linux:3all versions · fixed in 18.2.1-1
  • civetwebUbuntu:25.10all versions · no fixed version listed
  • civetwebopenSUSE:Leap 15.2all versions · fixed in 1.15-lp152.2.3.1
  • civetwebDebian:14all versions · fixed in 1.15+dfsg-1
  • civetwebDebian:13all versions · fixed in 1.15+dfsg-1
  • civetwebDebian:12all versions · fixed in 1.15+dfsg-1

Vendor advisories

  • CVE-2020-27304 Red Hat Product Security1 product fixed · 47 known affected

    civetweb: directory traversal when using the built-in example HTTP form-based file upload mechanism via the mg_handle_form_request API

    ceph-base as a component of Red Hat Ceph Storage 2 · ceph-common as a component of Red Hat Ceph Storage 2 · ceph-fuse as a component of Red Hat Ceph Storage 2 · +44 more

  • ICSA-22-167-09 CISA1 known affected

    Siemens SCALANCE LPE9403 Third-Party Vulnerabilities

    SCALANCE LPE9403

  • SSA-222547 Siemens ProductCERT1 known affected

    SSA-222547: Third-Party Component Vulnerabilities in SCALANCE LPE9403 before V2.0

    SCALANCE LPE9403

  • ICSA-22-069-09 CISA1 known affected

    Siemens SINEC INS

    SINEC INS

  • SSA-389290 Siemens ProductCERT1 known affected

    SSA-389290: Third-Party Component Vulnerabilities in SINEC INS

    SINEC INS

  • RHSA-2021:4902 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: ACS 3.67 security and enhancement update

Full record on NVD

Fix

  1. Update Civetweb project civetweb to 1.15
  2. Vendor fix Siemens ProductCERT SSA-222547 · 1 productUpdate to V2.0 or later version
  3. Vendor fix CISA ICSA-22-167-09 · 1 productUpdate to V2.0 or later version
  4. Vendor fix Siemens ProductCERT SSA-389290 · 1 productUpdate to V1.0.1.1 or later version
  5. Vendor fix CISA ICSA-22-069-09 · 1 productUpdate to V1.0.1.1 or later version
  6. Vendor fix Red Hat Product Security RHSA-2021:4902 · 1 productTo take advantage of these new features, fixes and changes, please upgrade Red Hat Advanced Cluster Security for Kubernetes to version 3.67.
  7. No fix planned, says the vendor Red Hat Product Security CVE-2020-27304 · 47 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-23known since 2026-10-23
  • NVDweakness (CWE)CWE-22read 2026-10-23
  • FIRST EPSSEPSS score3.3 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-10-21
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wphm-mh7c-38cf

Frequently asked questions

What is CVE-2020-27304?

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

Is CVE-2020-27304 actively exploited?

Active exploitation of CVE-2020-27304 has not been confirmed. Its EPSS score was 3.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-27304?

CVE-2020-27304 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Running civetweb? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record