8.8

CVE-2020-13671: Drupal core Un-restricted Upload of File

CVSS: 8.8v3.1HighKEVAnalyzed
AliasesUBUNTU-CVE-2020-13671
Published 20-11-2020Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2020-13671 is a high (CVSS 8.8) vulnerability in Drupal Drupal core. It is known to be exploited: CISA lists it, first on 18-01-2022. EPSS estimates a 36.17% chance of exploitation in the next 30 days, higher than 98.4% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
36.17%
0%100%
High · +0.82 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 2
DLA-2458-1USN-6981-1USN-6981-2

Timeline

  1. 20-11-2020
    PublishedVulnerability first disclosed.
  2. 18-01-2022
    Added to CISA KEVDrupal core Un-restricted Upload of File
  3. 18-07-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

36.17%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

+0.82 pp

From 35.35% on 19-09-2026

19-09-202619-10-2026
EPSS score
36.17%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
18-01-2022
Federal due date
18-07-2022

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2020-13671

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Drupal2 products
  • drupal≥ 7.0, < 7.74 | ≥ 8.8.0, < 8.8.11 | ≥ 8.9.0, < 8.9.9 | ≥ 9.0.0, < 9.0.8
  • drupal core9.0 versions prior to 9.0.8 | 8.9 versions prior to 8.9.9 | 8.8 versions prior to 8.8.11 | 7 versions prior to 7.74
Fedoraproject1 product
Ubuntu1 product
  • drupal7< 7.26-1ubuntu0.1+esm2 | < 7.44-1ubuntu1~16.04.0+esm2

3 vendors · 4 products

References

10 links