Quick answers
- Is CVE-2026-71921 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-71921 being exploited in the wild.
- How severe is CVE-2026-71921?
- Critical severity, with a CVSS score of 9.8, published 24 August 2026.
- Which products and versions are affected?
- DrayTek VigorSwitch FX2120 < 3.9.10; DrayTek VigorSwitch G1280 < 2.9.10; DrayTek VigorSwitch G1282 < 2.9.10; DrayTek VigorSwitch G2100 < 2.9.10; and 24 more.
- Is there a fix for CVE-2026-71921?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-71921 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-71921?
- Check whether you run DrayTek VigorSwitch FX2120, DrayTek VigorSwitch G1280, DrayTek VigorSwitch G1282 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an OS command injection (CWE-78) in the setget.cgi interface of multiple VigorSwitch models. Insufficient input filtering on the pass field allows an unauthenticated remote attacker to inject arbitrary OS commands that are executed with root privileges. The attack requires only network connectivity to the switch's web management interface; no authentication or user interaction is necessary. Exploitation allows the attacker to achieve remote code execution with full system privileges. DrayTek has released patched firmware versions for all affected models with specific version numbers ranging from 2.9.10 to 3.10.6 depending on the model.
Affected products
- DrayTek VigorSwitch G2540xs < 3.9.10
- DrayTek VigorSwitch P2540xs < 3.9.10
- DrayTek VigorSwitch FX2120 < 3.9.10
- DrayTek VigorSwitch G2282x < 2.10.6
- DrayTek VigorSwitch P2282x < 2.10.6
- DrayTek VigorSwitch Q2300x < 2.10.7
- DrayTek VigorSwitch PQ2300xb < 2.10.7
- DrayTek VigorSwitch G2542x < 3.10.6
- DrayTek VigorSwitch P2542x < 3.10.6
- DrayTek VigorSwitch P2542xh < 3.10.6
- DrayTek VigorSwitch PX2060 < 2.9.10
- DrayTek VigorSwitch G1280 < 2.9.10
- DrayTek VigorSwitch P1280 < 2.9.10
- DrayTek VigorSwitch P1281x < 2.9.10
- DrayTek VigorSwitch G1282 < 2.9.10
- DrayTek VigorSwitch P1282 < 2.9.10
- DrayTek VigorSwitch G2121 < 2.9.10
- DrayTek VigorSwitch P2121 < 2.9.10
- DrayTek VigorSwitch PQ2121x < 2.9.10
- DrayTek VigorSwitch Q2121x < 2.9.10
- DrayTek VigorSwitch G2280x < 2.9.10
- DrayTek VigorSwitch P2280x < 2.9.10
- DrayTek VigorSwitch Q2200x < 2.9.10
- DrayTek VigorSwitch PQ2200xb < 2.9.10
- DrayTek VigorSwitch G2100 < 2.9.10
- DrayTek VigorSwitch P2100 < 2.9.10
- DrayTek VigorSwitch G2540x < 2.9.10
- DrayTek VigorSwitch P2540x < 2.9.10
Timeline
- 2026-08-24: disclosed