TI-2021-07878 Aliases CVE-2021-25811 GHSA-575x-p9rr-ph24

MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the…

LOW 36Published 2021-04-29 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listen_http_lan parameter. Upon subsequent device restarts after this vulnerability is exploted the device will not be able to access the webserver unless the listen_http_lan parameter to uhttpd.json is manually fixed.

Why it matters now

EPSS 0.0163 76th percentileScored 2026-11-07

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

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:mercusys:mercury_x18g_firmware:1.0.5:::::::*	1.0.5	Vulnerable	Mercusys
cpe:2.3:h:mercusys:mercury_x18g:-:::::::*	not specified by NVD	Running on	Mercusys

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

2026-10-02 Threatist record created from CVE-2021-25811
2026-10-03 Alias added: GHSA-575x-p9rr-ph24

References

Advisory 2

Other 1

https://github.com/pokerfacett/MY_REQUEST/blob/master/Mercury%20Router%20X18g%20v1.0.5%20Denial%20of%20Service.md

TI-2021-05991 MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ in conjunction with… CVSS 3.1MEDIUM 5.3
TI-2021-07877 Cross site Scripting (XSS) vulnerability in MERCUSYS Mercury X18G 1.0.5 devices, via… CVSS 3.1MEDIUM 6.1
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