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TI-2021-07877 Aliases CVE-2021-25810GHSA-xmf3-54fg-fhvv

Cross site Scripting (XSS) vulnerability in MERCUSYS Mercury X18G 1.0.5 devices, via…

Priority LOW 29CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

Cross site Scripting (XSS) vulnerability in MERCUSYS Mercury X18G 1.0.5 devices, via crafted values to the 'src_dport_start', 'src_dport_end', and 'dest_port' parameters.

Why it matters now

EPSS 0.01111 66th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:mercusys:mercury_x18g_firmware:1.0.5:*:*:*:*:*:*:*1.0.5VulnerableMercusys
cpe:2.3:h:mercusys:mercury_x18g:-:*:*:*:*:*:*:*not specified by NVDRunning onMercusys
  • cpe:2.3:o:mercusys:mercury_x18g_firmware:1.0.5:*:*:*:*:*:*:* Versions 1.0.5 Vulnerable ·Mercusys
  • cpe:2.3:h:mercusys:mercury_x18g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mercusys

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-25810
  2. 2026-10-03 Alias added: GHSA-xmf3-54fg-fhvv

References

Exploit 1

Advisory 1

Other 1

  • TI-2021-05991 MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ in conjunction with… CVSS 3.1MEDIUM 5.3
  • TI-2021-07878 MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the… CVSS 3.1HIGH 7.5
  • TI-2021-05992 MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server… CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences