High Injection

CVE-2026-71929 — DrayTek VigorSwitch Multiple Models OS Command Injection via setDevProto

Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the setDevProto function. The vulnerability is caused by insufficient filtering of the username and password fields before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges. Exploitation requires valid administrative credentials for the device's web management interface.

Published Aug 24, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulnCheck

Low

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 2.3% (30-day exploitation probability)+12
Technical severity (high)+6

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

2.27%

ahead of 83% of scored CVEs · Oct 14, 2026

Affects

DrayTek Corporation

VigorSwitch FX2120 and 27 more

CVSS base

7.2

High · 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

None

none · proof-of-concept · active

Automatable

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 (DrayTek Corporation VigorSwitch FX2120, DrayTek Corporation VigorSwitch G1280, DrayTek Corporation VigorSwitch G1282…).
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
DrayTek Corporation	VigorSwitch FX2120	< 3.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G1280	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G1282	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G2100	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G2121	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G2280x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G2282x	< 2.10.6	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G2540x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G2540xs	< 3.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch G2542x	< 3.10.6	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P1280	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P1281x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P1282	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2100	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2121	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2280x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2282x	< 2.10.6	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2540x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2540xs	< 3.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2542x	< 3.10.6	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch P2542xh	< 3.10.6	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch PQ2121x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch PQ2200xb	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch PQ2300xb	< 2.10.7	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch PX2060	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch Q2121x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch Q2200x	< 2.9.10	Vulnerable	CVE Program (cve.org) e CISA ADP
DrayTek Corporation	VigorSwitch Q2300x	< 2.10.7	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

High

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
8.6	CVSS 4.0	High	—	—	disclosure@vulncheck.com via NIST National Vulnerability Database
8.6	CVSS 4.0	High	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP
7.2	CVSS 3.1	High	1.2	5.9	disclosure@vulncheck.com via NIST National Vulnerability Database
7.2	CVSS 3.1	High	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP

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

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-78 · OS Command Injection

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 2.27%

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)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · draytek corporation/vigorswitch g2540xs, draytek corporation/vigorswitch p2540xs, draytek corporation/vigorswitch fx2120
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 · 7.2
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
Aug 24, 2026 · VulnCheck

Source activity

Repeated readings are counted rather than listed.

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

References

2 on the record

www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-os-command-injection-v
third-party-advisory, NIST National Vulnerability Database
www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-serie
vendor-advisory, NIST National Vulnerability Database

Elsewhere on this site

DrayTek Corporation
every CVE for this vendor

Injection
same class

CWE-78
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-71943 DrayTek VigorSwitch Multiple Models OS Command Injection via setDevNet Aug 24, 2026
High CVE-2026-71941 DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail Aug 24, 2026
High CVE-2026-71938 DrayTek VigorSwitch Multiple Models Buffer Overflow via switch_lan_gvrp Aug 24, 2026
High CVE-2026-71940 DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Edit ACE Aug 24, 2026
High CVE-2026-71939 DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Add ACE Aug 24, 2026
High CVE-2026-71942 DrayTek VigorSwitch Multiple Models Buffer Overflow via mail_mailalert Aug 24, 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-2026-71929 is "DrayTek VigorSwitch Multiple Models OS Command Injection via setDevProto", rated High. It affects VigorSwitch FX2120 (DrayTek Corporation); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.2 describes technical severity. EPSS 2.27% 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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