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CVE-2020-23478

19
FAUCET Score

CVE-2020-23478 describes a Regular Expression Denial of Service (ReDoS) vulnerability in Leo Editor v6.2.1, specifically within the plugins/importers/dart.py component. This vulnerability carries a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity, leading to a complete denial of service. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
6.2.1CPE matchmatch criteria
cpe:2.3:a:leoeditor:leo:6.2.1:*:*:*:*:*:*:*

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
1.23%
Probability of exploitation in next 30 days
EPSS Percentile
65.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0123 is in the 45th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

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 (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: leoFixed in: 6.3

Vendor Advisories (1)

pipGHSA-x38q-xg2h-rxgxhigh

Regular Expression Denial of Service in Leo Editor

Sep 23, 2021

References

cwe.mitre.org / data/definitions/1333.html
Third Party Advisory
github.com / leo-editor/leo-editor/issues/1597
ExploitIssue TrackingPatchThird Party Advisory