CVE-2020-28493

Aliases:GHSA-g3rq-g295-4j3mPYSEC-2021-66SNYK-PYTHON-JINJA2-1012994ALPINE-CVE-2020-28493DEBIAN-CVE-2020-28493
Advisory lineage Upstream: 0 Downstream: 19
Modified
Published: 01 Feb 2021, 19:30
Last modified:16 Sept 2024, 17:24

Vulnerability Summary

Overall Risk (default)
medium
32/100
CVSS Score
5.3 MEDIUM
v3.1 (cve.org)
EPSS Score
3.55% LOW
4% probability +3.34%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

01 Feb 2021, 19:30
Published
Vulnerability first disclosed
16 Sept 2024, 17:24
Last Modified
Vulnerability information updated

Description

This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDoS vulnerability is mainly due to the `_punctuation_re regex` operator and its use of multiple wildcards. The last wildcard is the most exploitable as it searches for trailing punctuation. This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.

CVSS Metrics

  • v4.0•MEDIUM•Score: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P
  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 3.55%• Percentile: 89%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

Affected Systems

  • alpine•py3-jinja2

    < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0 | < 1.11.3-r0

  • debian•jinja2

    < 2.11.3-1 | < 2.11.3-1 | < 2.11.3-1 | < 2.11.3-1

  • fedoraproject•fedora

    33

  • palletsprojects•jinja

    < 2.11.3

  • PyPI•jinja2

    < 2.11.3

References (14)