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CVE-2021-27405

Regular expression Denial of Service in @progfay/scrapbox-parser

7.5 HighFix available

A ReDoS (regular expression denial of service) flaw was found in the @progfay/scrapbox-parser package before 6.0.3 for Node.js.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.76%Up 0.5 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used7.5

A ReDoS (regular expression denial of service) flaw was found in the @progfay/scrapbox-parser package before 6.0.3 for Node.js.

Record
CVE-2021-27405
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-400
Updated
2026-11-02
CVE ListNo score

A ReDoS (regular expression denial of service) flaw was found in the @progfay/scrapbox-parser package before 6.0.3 for Node.js.

Record
CVE-2021-27405
Updated
2026-11-02
EUVDEUVD-2021-0640No score

A ReDoS (regular expression denial of service) flaw was found in the @progfay/scrapbox-parser package before 6.0.3 for Node.js.

Record
EUVD-2021-0640
Updated
2026-11-03
GitHub AdvisoriesGHSA-9fhw-r42p-5c7r4.3

Regular expression Denial of Service in @progfay/scrapbox-parser

Impact

A Regular expression Denial of Service 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

For more information

If you have any questions or comments about this advisory:

Record
GHSA-9fhw-r42p-5c7r
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400
Updated
2026-11-02
OSVGHSA-9fhw-r42p-5c7r4.3

Regular expression Denial of Service in @progfay/scrapbox-parser

Impact

A Regular expression Denial of Service 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

For more information

If you have any questions or comments about this advisory:

Record
GHSA-9fhw-r42p-5c7r
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
@progfay/scrapbox-parser
npm
before 6.0.3
6.0.3
@progfay/scrapbox-parser
npm
7.0.0 up to 7.0.2
7.0.2

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-27405 is a high vulnerability (CVSS 7.5) in Scrapbox-parser Project Scrapbox-parser, published February 19, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.76%, the 78th percentile. Fixed in @progfay/scrapbox-parser 6.0.3.

References

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