CVE-2026-71941 (GCVE-0-2026-71941)
Vulnerability from cvelistv5 – Published: 2026-08-24 17:08 – Updated: 2026-08-27 13:53
VLAI
EPSS
VEX
Title
DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 13:53 UTC
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.draytek.com/about/security-advisory/m… | vendor-advisory |
| https://www.vulncheck.com/advisories/draytek-vigo… | third-party-advisory |
Impacted products
28 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| DrayTek Corporation | VigorSwitch G2540xs |
Affected:
0 , < 3.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2540xs |
Affected:
0 , < 3.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch FX2120 |
Affected:
0 , < 3.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G2282x |
Affected:
0 , < 2.10.6
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2282x |
Affected:
0 , < 2.10.6
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch Q2300x |
Affected:
0 , < 2.10.7
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch PQ2300xb |
Affected:
0 , < 2.10.7
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G2542x |
Affected:
0 , < 3.10.6
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2542x |
Affected:
0 , < 3.10.6
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2542xh |
Affected:
0 , < 3.10.6
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch PX2060 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G1280 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P1280 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P1281x |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G1282 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P1282 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G2121 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2121 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch PQ2121x |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch Q2121x |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G2280x |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2280x |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch Q2200x |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch PQ2200xb |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G2100 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2100 |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch G2540x |
Affected:
0 , < 2.9.10
(custom)
|
guessed | |
| DrayTek Corporation | VigorSwitch P2540x |
Affected:
0 , < 2.9.10
(custom)
|
guessed |
Date Public
2026-08-24 00:00
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-24T17:08:04.706Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/"
},
{
"name": "VulnCheck Advisory: DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-diag-logmail"
}
],
"title": "DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail",
"x_generator": {
"engine": "vulncheck-endgame"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-71941",
"datePublished": "2026-08-24T17:08:04.706Z",
"dateReserved": "2026-08-08T16:37:44.519Z",
"dateUpdated": "2026-08-27T13:53:21.910Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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