Answer in brief
CVE-2026-71920 records a Unknown severity vulnerability in DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout. The current sources do not mark it as known exploited. The current feed maps DrayTek Corporation/VigorSwitch FX2120 (generic), DrayTek Corporation/VigorSwitch G1280 (generic), DrayTek Corporation/VigorSwitch G1282 (generic), DrayTek Corporation/VigorSwitch G2100 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps DrayTek Corporation/VigorSwitch FX2120 (generic), DrayTek Corporation/VigorSwitch G1280 (generic), DrayTek Corporation/VigorSwitch G1282 (generic), DrayTek Corporation/VigorSwitch G2100 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| DrayTek Corporation/VigorSwitch FX2120generic | >=0 <3.9.10 | 3.9.10 |
| DrayTek Corporation/VigorSwitch G1280generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch G1282generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch G2100generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch G2121generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch G2280xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch G2282xgeneric | >=0 <2.10.6 | 2.10.6 |
| DrayTek Corporation/VigorSwitch G2540xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch G2540xsgeneric | >=0 <3.9.10 | 3.9.10 |
| DrayTek Corporation/VigorSwitch G2542xgeneric | >=0 <3.10.6 | 3.10.6 |
| DrayTek Corporation/VigorSwitch P1280generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch P1281xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch P1282generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch P2100generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch P2121generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch P2280xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch P2282xgeneric | >=0 <2.10.6 | 2.10.6 |
| DrayTek Corporation/VigorSwitch P2540xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch P2540xsgeneric | >=0 <3.9.10 | 3.9.10 |
| DrayTek Corporation/VigorSwitch P2542xgeneric | >=0 <3.10.6 | 3.10.6 |
| DrayTek Corporation/VigorSwitch P2542xhgeneric | >=0 <3.10.6 | 3.10.6 |
| DrayTek Corporation/VigorSwitch PQ2121xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch PQ2200xbgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch PQ2300xbgeneric | >=0 <2.10.7 | 2.10.7 |
| DrayTek Corporation/VigorSwitch PX2060generic | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch Q2121xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch Q2200xgeneric | >=0 <2.9.10 | 2.9.10 |
| DrayTek Corporation/VigorSwitch Q2300xgeneric | >=0 <2.10.7 | 2.10.7 |
Published upstream
Aug 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 24, 2026
Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device's web management interface.
Quoted source text, attributed separately from HOL analysis.