High severity7.5NVD Advisory· Published Apr 29, 2021· Updated Jun 17, 2026
CVE-2021-25811
CVE-2021-25811
Description
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.
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Affected products
3- MERCUSYS/Mercury X18Gdescription
- Range: = 1.0.5
Patches
Vulnerability mechanics
References
3- www.mercurycom.com.cn/product-521-1.htmlnvdProductVendor Advisory
- www.mercusys.com/en/nvdVendor Advisory
- github.com/pokerfacett/MY_REQUEST/blob/master/Mercury%20Router%20X18g%20v1.0.5%20Denial%20of%20Service.mdnvdBroken Link
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