CVE-2021-27405
Regular expression Denial of Service in @progfay/scrapbox-parser
Description
### Impact A [Regular expression Denial of Service](https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS) flaw was found in the @progfay/scrapbox-parser package before 6.0.3, 7.0.2 for Node.js. The attacker that is able to be parsed a specially crafted text may cause the application to consume an excessive amount of CPU. ### Patches Upgrade to version 6.0.3, 7.0.2 or later. ### Workarounds Avoid to parse text with a lot of `[` chars. ### References * https://github.com/progfay/scrapbox-parser/pull/519 * https://github.com/progfay/scrapbox-parser/pull/539 * https://github.com/progfay/scrapbox-parser/pull/540 * https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-27405 * https://snyk.io/vuln/SNYK-JS-PROGFAYSCRAPBOXPARSER-1076803 ### For more information If you have any questions or comments about this advisory: * Open an issue in [github.com/progfay/scrapbox-parser](https://github.com/progfay/scrapbox-parser/issues)
How to fix CVE-2021-27405
To remediate CVE-2021-27405, upgrade the affected package to a fixed version below.
- —upgrade to 6.0.3 or later
Is CVE-2021-27405 being exploited?
Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 6.0.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |