CVE-2021-21391
Regular expression Denial of Service in multiple packages
02 Description
Regular expression Denial of Service in multiple packages
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.66% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 76.2% of scored records. A rank, not a probability.
- NVD base score
- 6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-04-29 00:20Z5 YR AGO
- Last updated
- 2024-08-03 18:09Z2 YR AGO
- Reserved
- 2020-12-22
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400Uncontrolled Resource ConsumptionClass
- Data version
- 5.1
- Document digest
- 4e617537f55f28ff185f7a965ad4ca8d6ab4c45b06b2c72ed892db8574b052fd
05 Affected products
06 References
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm
- github.comhttps://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-engine
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-font
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-image
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-list
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-media-embed
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-paste-from-office
- www.npmjs.comhttps://www.npmjs.com/package/%40ckeditor/ckeditor5-widget
07 Fixed in
Ubuntu 18.04 LTS
- ckeditor3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- ckeditor3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- ckeditor3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- ckeditor3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.