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ExploitedIn CISA KEVFix available

CVE-2020-13671

Exploitation confirmed. First attested on 2022-01-18 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-11-20
  • Fixed in9.0.8 · 8.9.9 · 8.8.11 · 7.74 · 7.74.0
  • WeaknessCWE-434

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

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.

Timeline

dates in UTC
  1. 2020-11-2016:15CVE publishedNVD
  2. 2022-01-18Added to the CISA KEV catalogCISA KEV
  3. 2022-01-18Listed as exploited by GCVEGCVE
  4. 2022-01-18Exploitation first reportedCISA KEV
  5. 2025-02-0712:38SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-13671?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-13671?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Drupal
BranchAffectedFixed in
9.0≥ 9.0.0, < 9.0.89.0.8
8.9≥ 8.9.0, < 8.9.98.9.9
8.8≥ 8.8.0, < 8.8.118.8.11
8.x≥ 8.0.0, < 8.8.118.8.11
7.x≥ 7.0, < 7.747.74
7.x≥ 7.0.0, < 7.74.07.74.0
7.x≥ 7.0.0, < 7.747.74
Fedoraproject fedora
BranchAffectedFixed in
32.x= 32no fix published
33.x= 33no fix published

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

Products declared by the CNA1 product

As drupal, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Drupal Core
    Affected
    • = 9.0 versions prior to 9.0.8no fix stated
    • = 8.9 versions prior to 8.9.9no fix stated
    • = 8.8 versions prior to 8.8.11no fix stated
    • = 7 versions prior to 7.74no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-12-15

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

  • drupal7Ubuntu:Pro:16.04:LTSall versions · fixed in 7.44-1ubuntu1~16.04.0+esm2
  • drupal7Ubuntu:Pro:14.04:LTSall versions · fixed in 7.26-1ubuntu0.1+esm2
  • drupal7Debian:9all versions · fixed in 7.52-2+deb9u12
  • drupal7CleanStartall versions · fixed in 7.74-r0
  • drupal7Alpine:v3.20all versions · fixed in 7.74-r0
  • drupal7Alpine:v3.19all versions · fixed in 7.74-r0
  • drupal7Alpine:v3.18all versions · fixed in 7.74-r0
  • drupal7Alpine:v3.17all versions · fixed in 7.74-r0

6 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-13671 Red Hat Product Security

    drupal: improper filename sanitization can lead to remote code execution

Full record on NVD

Fix

  1. Update Drupal to 9.0.8 · 8.9.9 · 8.8.11 · 7.74 · 7.74.0
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-07-18

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedDungsocool/CVE-2020-13671-oldDungsocool/CVE-2020-13671ivanesk315/CVE-2020-13671
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-01-18
Patch Due Date
2022-07-18
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2020-11-20
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-68jc-v27h-vhmw

Frequently asked questions

What is CVE-2020-13671?

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.

Is CVE-2020-13671 actively exploited?

Yes. CVE-2020-13671 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-07-18.

What is the CVSS score for CVE-2020-13671?

CVE-2020-13671 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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