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CVE-2021-27405

24
FAUCET Score

CVE-2021-27405 describes a Regular Expression Denial of Service (ReDoS) vulnerability in the @progfay/scrapbox-parser package for Node.js, affecting versions prior to 6.0.3. This high-severity flaw (CVSS 7.5) has a low attack complexity and requires no user interaction, allowing an unauthenticated attacker to cause a denial of service. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.0.3CPE matchmatch criteria
cpe:2.3:a:scrapbox-parser_project:scrapbox-parser:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.76%
Probability of exploitation in next 30 days
EPSS Percentile
75.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0176 is in the 58th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @progfay/scrapbox-parserFixed in: 6.0.3
npmpatch availablevia ghsa
Product: @progfay/scrapbox-parserFixed in: 7.0.2

Vendor Advisories (1)

npmGHSA-9fhw-r42p-5c7rmedium

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

Mar 1, 2021

References

github.com / progfay/scrapbox-parser/pull/519
PatchThird Party Advisory
github.com / progfay/scrapbox-parser/pull/539
PatchThird Party Advisory
github.com / progfay/scrapbox-parser/pull/540
PatchThird Party Advisory
security.netapp.com / advisory/ntap-20210326-0002
Third Party Advisory