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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2021-25810

20
FAUCET Score

CVE-2021-25810 describes a Cross-Site Scripting (XSS) vulnerability affecting MERCUSYS Mercury X18G devices running firmware version 1.0.5. This vulnerability allows an unauthenticated attacker to inject malicious scripts into a user's browser by manipulating the 'src_dport_start', 'src_dport_end', and 'dest_port' parameters. Rated Medium (CVSS 6.1), it requires user interaction and could lead to limited confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.5CPE matchmatch criteria
cpe:2.3:o:mercusys:mercury_x18g_firmware:1.0.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.11%
Probability of exploitation in next 30 days
EPSS Percentile
62.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0111 is in the 75th percentile among its peer group of 26,234 CVEs.

Social Chatter

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

Remediation

Remediation records are not available for this CVE.

References

github.com / pokerfacett/MY_REQUEST/blob/master/Mercury%20Router%20X18g%20v1.0.5%20Stored%20XSS.md
ExploitThird Party Advisory
mercurycom.com.cn / product-521-1.html
Broken Link
mercusys.com / en
Vendor Advisory