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Weekly Signal
Live intelligence Updated 20 Aug 2026 · 23:28 UTC

Drupal, Fedoraproject · Drupal, Drupal Core, Fedora

CVE-2020-13671

Drupal core Un-restricted Upload of File

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. Vendor advisory from www.drupal.org

View response plan
CVSS8.8
EPSS4.4%
KEVYes
ExploitationConfirmed exploitation
RemediationFixed release identified ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 4.4%; technical severity is CVSS 8.8.

Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.

Who should care

  • Teams operating Drupal, Drupal Core, Fedora
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Drupal, Drupal Core, Fedora is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Vendor advisory from www.drupal.org
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Upgrade

Required Action

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-434
Affected versions
Drupal Drupal (Start Including 7.0, End Excluding 7.74 | Start Including 8.8.0, End Excluding 8.8.11 | Start Including 8.9.0, End Excluding 8.9.9 | Start Including 9.0.0, End Excluding 9.0.8); Drupal Drupal Core; Fedoraproject Fedora (Version 32 | Version 33)
Fixed versions
Drupal Drupal (Fixed from 7.74, 8.8.11, 8.9.9, 9.0.8)
Published
20 November 2020
Attack vector
Network
Privileges required
Low
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 4.4%
  4. Signal calculated at 68

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.