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CVE-2020-13671

Drupal core Un-restricted Upload of File

8.8 HIGHActively exploited (CISA KEV)EPSS 35.4%
  1. Published20 Nov 2020
  2. Added to CISA KEV18 Jan 2022
  3. Remediation due18 Jul 2022
Actively exploited (CISA KEV)

Improper sanitization in the extension file names is present in Drupal core.

Added to KEV: 18 Jan 2022Federal remediation due: 18 Jul 2022

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Drupal≥ 7.0 < 7.74 · ≥ 8.8.0 < 8.8.11 · ≥ 8.9.0 < 8.9.9 · ≥ 9.0.0 < 9.0.8
Fedoraproject Fedora32 · 33

Remediation

Fixed in
Drupal≥ 7.74

References

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Frequently asked

Is CVE-2020-13671 being actively exploited?

Yes. CVE-2020-13671 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 18 Jan 2022.

How severe is CVE-2020-13671?

CVE-2020-13671 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 35.4% probability of exploitation.

Which products are affected by CVE-2020-13671?

Affected products include Drupal, Fedoraproject Fedora.

How do I fix CVE-2020-13671?

Upgrade affected software to a fixed version, for example Drupal 7.74 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-13671 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.