Critical Injection exploit reference

CVE-2026-9543 — Totolink N300RH Web Management cstecgi.cgi setPasswordCfg os command injection

A vulnerability has been found in Totolink N300RH 6.1c.1353_B20190305. Affected is the function setPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument admpass leads to os command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used.

Published May 26, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Moderate

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 3.3% (30-day exploitation probability)+13
Technical severity (critical)+10
CISA SSVC: exploitation "poc"+5
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

3.25%

ahead of 88% of scored CVEs · Oct 14, 2026

Affects

Totolink

N300RH

CVSS base

9.8

Critical · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Totolink N300RH).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Totolink	N300RH	version 6.1c.1353_B20190305	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
9.3	CVSS 4.0	Critical	—	—	VulDB via CVE Program (cve.org) e CISA ADP
8.9	CVSS 4.0	High	—	—	cna@vuldb.com via NIST National Vulnerability Database
9.8	CVSS 3.1	Critical	3.9	5.9	cna@vuldb.com via NIST National Vulnerability Database
9.8	CVSS 3.1	Critical	—	—	VulDB via CVE Program (cve.org) e CISA ADP
9.8	CVSS 3.0	Critical	—	—	VulDB via CVE Program (cve.org) e CISA ADP
10.0	CVSS 2.0	High	10.0	10.0	cna@vuldb.com via NIST National Vulnerability Database
10.0	CVSS 2.0	High	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-77 · Command Injection

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 3.25%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Look for parameters with command/query metacharacters and unexpected child processes of the service.

web/proxy/WAF logsnetwork IDS/IPSapplication logsendpoint telemetry (EDR)

Analysis and videos

CVE-2026-9543: Totolink N300RH Web Management cstecgi.cgi setPasswordCfg OS Command Injection
CVE-2026-9543 is a critical OS command injection flaw in the setPasswordCfg function of /cgi-bin/cstecgi.cgi in the web management interface of Totolink N300RH version 6.1c.1353_B20190305. According to the record, the admpass argument can be manipulated to run operating system commands remotely. The CNA VulDB assigned a CVSS 3.1 base score of 9.8, and the exploit has been publicly disclosed, but no fix is listed in the record.

Timeline

What happened to this CVE, newest first.

2026
Affected products added · totolink/n300rh
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 9.8
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
May 26, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

5 on the record

vuldb.com/submit/815068
third-party-advisory, NIST National Vulnerability Database
vuldb.com/vuln/365607
vdb-entry, technical-description, NIST National Vulnerability Database
github.com/A1ester/TOTOLINK-N300RH-Command-Injection
exploit, NIST National Vulnerability Database
www.totolink.net/
product, NIST National Vulnerability Database
vuldb.com/vuln/365607/cti
signature, permissions-required, NIST National Vulnerability Database

Elsewhere on this site

Totolink
every CVE for this vendor

Injection
same class

CWE-77
other pages naming this weakness

Related CVEs (same products)

Critical CVE-2026-10187 Totolink N300RH Web Management wireless.so setWiFiBasicConfig stack-based overflow May 31, 2026
High CVE-2026-7749 Totolink N300RH POST Request cstecgi.cgi setWanConfig buffer overflow May 4, 2026
High CVE-2026-7750 Totolink N300RH POST Request cstecgi.cgi setMacFilterRules buffer overflow May 4, 2026
High CVE-2026-7748 Totolink N300RH POST Request cstecgi.cgi setUpgradeFW buffer overflow May 4, 2026
Critical CVE-2026-7747 Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow May 4, 2026
Medium CVE-2026-7633 Totolink N300RH cstecgi.cgi setUploadSetting file inclusion May 2, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-9543 is "Totolink N300RH Web Management cstecgi.cgi setPasswordCfg os command injection", rated Critical. It affects N300RH (Totolink); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. EPSS 3.25% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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