CVE-2026-5853 is an os command injection vulnerability affecting Totolik A7100RU router firmware version 7.4cu.2313_b20191024, specifically in the setIpv6LanCfg function of the /cgi-bin/cstecgi.cgi CGI handler component. The vulnerability stems from improper input validation of the addrPrefixLen parameter, allowing attackers to inject and execute arbitrary system commands. The vulnerability carries a critical CVSS 3.1 score of 9.8, indicating a remote network-based attack vector that requires no authentication, no user interaction, and no special privileges, with potential for complete compromise of confidentiality, integrity, and availability. While exploit code has been publicly disclosed, active exploitation in the wild is not currently documented in the Known Exploited Vulnerabilities (KEV) catalog, and the vulnerability remains on the inactive Hot List. The EPSS score of 0.0125 suggests a relatively low probability of exploitation in real-world scenarios compared to other published vulnerabilities.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| Totolink | A7100RU | 7.4cu.2313_b20191024CNA affected |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.