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CVE-2026-71936

HIGHCVSS 7.2/10EPSS 0.48%

Last modified

CVE-2026-71936 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the sysreboot function. The vulnerability is caused by unsafe concatenation of split valueN data into a fixed-size buffer. EPSS estimates a 0.48% chance of exploitation in the next 30 days.

Description

Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the sysreboot function. The vulnerability is caused by unsafe concatenation of split valueN data into a fixed-size buffer. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.

Metrics

CVSS 3.1
7.2/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0
8.6/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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:X/V:X/RE:X/U:X

EPSS Probability
0.48%

39.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
DrayTek CorporationVigorSwitch G2540xs< 3.9.10
DrayTek CorporationVigorSwitch P2540xs< 3.9.10
DrayTek CorporationVigorSwitch FX2120< 3.9.10
DrayTek CorporationVigorSwitch G2282x< 2.10.6
DrayTek CorporationVigorSwitch P2282x< 2.10.6
DrayTek CorporationVigorSwitch Q2300x< 2.10.7
DrayTek CorporationVigorSwitch PQ2300xb< 2.10.7
DrayTek CorporationVigorSwitch G2542x< 3.10.6
DrayTek CorporationVigorSwitch P2542x< 3.10.6
DrayTek CorporationVigorSwitch P2542xh< 3.10.6
DrayTek CorporationVigorSwitch PX2060< 2.9.10
DrayTek CorporationVigorSwitch G1280< 2.9.10
DrayTek CorporationVigorSwitch P1280< 2.9.10
DrayTek CorporationVigorSwitch P1281x< 2.9.10
DrayTek CorporationVigorSwitch G1282< 2.9.10
DrayTek CorporationVigorSwitch P1282< 2.9.10
DrayTek CorporationVigorSwitch G2121< 2.9.10
DrayTek CorporationVigorSwitch P2121< 2.9.10
DrayTek CorporationVigorSwitch PQ2121x< 2.9.10
DrayTek CorporationVigorSwitch Q2121x< 2.9.10
DrayTek CorporationVigorSwitch G2280x< 2.9.10
DrayTek CorporationVigorSwitch P2280x< 2.9.10
DrayTek CorporationVigorSwitch Q2200x< 2.9.10
DrayTek CorporationVigorSwitch PQ2200xb< 2.9.10
DrayTek CorporationVigorSwitch G2100< 2.9.10
DrayTek CorporationVigorSwitch P2100< 2.9.10
DrayTek CorporationVigorSwitch G2540x< 2.9.10
DrayTek CorporationVigorSwitch P2540x< 2.9.10

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2026-71936?
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the sysreboot function. The vulnerability is caused by unsafe concatenation of split valueN data into a fixed-size buffer. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.
How severe is CVE-2026-71936?
CVE-2026-71936 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.
How do I fix CVE-2026-71936?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST