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Vulnerability record · CVE-2026-1326 · published 22 January 2026

CVE-2026-1326: Totolink nr1800x firmware injection vulnerability

TTotolink · Nr1800x Firmware

A weakness has been identified in Totolink NR1800X 9.1.0u.6279_B20210910. This vulnerability affects the function setWanCfg of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. This manipulation of the argument Hostname causes command injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

2.1 CVSS 4.0 Low EPSS 3.5% · top 10.9% CWE-74 · InjectionCWE-77 · Command injection
2.1CVSS 4.0 base score, v2 6.5
3.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

A weakness has been identified in Totolink NR1800X 9.1.0u.6279_B20210910. This vulnerability affects the function setWanCfg of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. This manipulation of the argument Hostname causes command injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lavender-bicycle-a5a.notion.site/TOTOLINK-NR1800X-setWanCfg-2e453a41781f80b390f3e1ce0d9dd5b9?source=copy_link ExploitThird Party Advisory
https://vuldb.com/?ctiid.342302 Permissions RequiredVDB Entry
https://vuldb.com/?id.342302 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.735787 Third Party AdvisoryVDB Entry
https://www.totolink.net/ Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-45841Totolink nr1800x firmware out-of-bounds write vulnerabilityTOTOLINK NR1800X V9.1.0u.6681_B20230703 was discovered to contain an authenticated stack overflow via the text parameter in the setSmsCfg function.EPSS 0.53%9.8CVE-2023-7220Totolink nr1800x firmware stack-based buffer overflow vulnerabilityA vulnerability was found in Totolink NR1800X 9.1.0u.6279_B20210910 and classified as critical. Affected by this issue is the function loginAuth of t…EPSS 1.5%9.8CVE-2023-36340Totolink nr1800x firmware out-of-bounds write vulnerabilityTOTOLINK NR1800X V9.1.0u.6279_B20210910 was discovered to contain a stack overflow via the http_host parameter in the function loginAuth.EPSS 0.70%9.8CVE-2022-41525Totolink nr1800x firmware os command injection vulnerabilityTOTOLINK NR1800X V9.1.0u.6279_B20210910 was discovered to contain a command injection vulnerability via the OpModeCfg function at /cgi-bin/cstecgi.cg…EPSS 1.9%9.8CVE-2022-41522Totolink nr1800x firmware out-of-bounds write vulnerabilityTOTOLINK NR1800X V9.1.0u.6279_B20210910 was discovered to contain an unauthenticated stack overflow via the "main" function.EPSS 1.1%9.8CVE-2022-41518Totolink nr1800x firmware os command injection vulnerabilityTOTOLINK NR1800X V9.1.0u.6279_B20210910 was discovered to contain a command injection vulnerability via the UploadFirmwareFile function at /cgi-bin/c…EPSS 1.9%8.8CVE-2025-45842Totolink nr1800x firmware out-of-bounds write vulnerabilityTOTOLINK NR1800X V9.1.0u.6681_B20230703 was discovered to contain an authenticated stack overflow via the ssid5g parameter in the setWiFiEasyCfg func…EPSS 0.91%8.8CVE-2025-45845Totolink nr1800x firmware out-of-bounds write vulnerabilityTOTOLINK NR1800X V9.1.0u.6681_B20230703 was discovered to contain an authenticated stack overflow via the ssid5g parameter in the setWiFiEasyGuestCfg…EPSS 0.71%

Source: NIST National Vulnerability Database (record CVE-2026-1326), CISA KEV, FIRST EPSS (scores of 2026-10-14). This page is refreshed as NVD updates the record.