🔐 CVE Alert

CVE-2026-71941

HIGH 7.2

DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail

CVSS Score
7.2
EPSS Score
0.0%
EPSS Percentile
0th

Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the diag_logmail function. The vulnerability is caused by concatenating multiple smtpReceiver email addresses into a fixed-size buffer without checking the remaining buffer size. 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.

CWE CWE-120
Vendor draytek corporation
Product vigorswitch g2540xs
Published Aug 24, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Affected Versions

DrayTek Corporation / VigorSwitch G2540xs
0 < 3.9.10
DrayTek Corporation / VigorSwitch P2540xs
0 < 3.9.10
DrayTek Corporation / VigorSwitch FX2120
0 < 3.9.10
DrayTek Corporation / VigorSwitch G2282x
0 < 2.10.6
DrayTek Corporation / VigorSwitch P2282x
0 < 2.10.6
DrayTek Corporation / VigorSwitch Q2300x
0 < 2.10.7
DrayTek Corporation / VigorSwitch PQ2300xb
0 < 2.10.7
DrayTek Corporation / VigorSwitch G2542x
0 < 3.10.6
DrayTek Corporation / VigorSwitch P2542x
0 < 3.10.6
DrayTek Corporation / VigorSwitch P2542xh
0 < 3.10.6
DrayTek Corporation / VigorSwitch PX2060
0 < 2.9.10
DrayTek Corporation / VigorSwitch G1280
0 < 2.9.10
DrayTek Corporation / VigorSwitch P1280
0 < 2.9.10
DrayTek Corporation / VigorSwitch P1281x
0 < 2.9.10
DrayTek Corporation / VigorSwitch G1282
0 < 2.9.10
DrayTek Corporation / VigorSwitch P1282
0 < 2.9.10
DrayTek Corporation / VigorSwitch G2121
0 < 2.9.10
DrayTek Corporation / VigorSwitch P2121
0 < 2.9.10
DrayTek Corporation / VigorSwitch PQ2121x
0 < 2.9.10
DrayTek Corporation / VigorSwitch Q2121x
0 < 2.9.10
DrayTek Corporation / VigorSwitch G2280x
0 < 2.9.10
DrayTek Corporation / VigorSwitch P2280x
0 < 2.9.10
DrayTek Corporation / VigorSwitch Q2200x
0 < 2.9.10
DrayTek Corporation / VigorSwitch PQ2200xb
0 < 2.9.10
DrayTek Corporation / VigorSwitch G2100
0 < 2.9.10
DrayTek Corporation / VigorSwitch P2100
0 < 2.9.10
DrayTek Corporation / VigorSwitch G2540x
0 < 2.9.10
DrayTek Corporation / VigorSwitch P2540x
0 < 2.9.10

References

NVD ↗ CVE.org ↗ EPSS Data ↗
draytek.com: https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/ vulncheck.com: https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-diag-logmail

Credits

Jincheng Wang (@winmt) Le Yu (Nanjing University of Posts and Telecommunications) Xiapu Luo (The Hong Kong Polytechnic University)