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CVE-2021-39427

20
FAUCET Score

CVE-2021-39427 is a cross-site scripting (XSS) vulnerability affecting vtimecn 188jianzhan version 2.10. An attacker can exploit this by injecting malicious code into the username parameter of the /admin/reg.php endpoint. This vulnerability has a CVSS score of 5.4 (Medium), indicating a network-based attack requiring low privileges and user interaction, with potential for low impact on confidentiality and integrity. There is currently no evidence of active exploitation, and no public exploit code or community discussion has been identified.

Impacted Technologies

VendorProductVersion(s)CPE
2.10CPE matchmatch criteria
cpe:2.3:a:vtimecn:188jianzhan:2.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
36.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 54th percentile among its peer group of 15,239 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

github.com / vtime-tech/188Jianzhan/issues/4
ExploitIssue TrackingThird Party Advisory