CASCACascade Atlas

Evidence dossier

CVE-2020-13671

CVE-2020-13671

60.4–81.1Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Nov 20, 2020
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS4.30%

2026-07-18 · v2026.06.15 · percentile 90.1%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

drupaloriginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

Drupal core Un-restricted Upload of File

FIRST EPSSoriginal assertion
model_probability

Probability 0.043040000000; percentile 0.900540000000

Applicability

Cited product scope

Trace impact →
DrupalDrupal Core
[{"status": "affected", "version": "9.0 versions prior to 9.0.8"}, {"status": "affected", "version": "8.9 versions prior to 8.9.9"}, {"status": "affected", "version": "8.8 versions prior to 8.8.11"}, {"status": "affected", "version": "7 versions prior to 7.74"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*; start including 7.0; end excluding 7.74supported
Unknown vendorUnknown product
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*; start including 8.8.0; end excluding 8.8.11supported
Unknown vendorUnknown product
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*; start including 8.9.0; end excluding 8.9.9supported
Unknown vendorUnknown product
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*; start including 9.0.0; end excluding 9.0.8supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

8.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.