FKIE_CVE-2026-25532
Vulnerability from fkie_nvd - Published: 2026-02-04 18:16 - Updated: 2026-06-17 10:24
Severity
6.3 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
8.0 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.0 (High) - CVSS:3.1/
Summary
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a vulnerability exists in the WPS (Wi-Fi Protected Setup) Enrollee implementation where malformed EAP-WSC packets with truncated payloads can cause integer underflow during fragment length calculation. When processing EAP-Expanded (WSC) messages, the code computes frag_len by subtracting header sizes from the total packet length. If an attacker sends a packet where the EAP Length field covers only the header and flags but omits the expected payload (such as the 2-byte Message Length field when WPS_MSG_FLAG_LEN is set), frag_len becomes negative. This negative value is then implicitly cast to size_t when passed to wpabuf_put_data(), resulting in a very large unsigned value. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.
References
{
"affected": [
{
"affectedData": [
{
"product": "esp-idf",
"vendor": "espressif",
"versions": [
{
"status": "affected",
"version": "= 5.5.2"
},
{
"status": "affected",
"version": "= 5.4.3"
},
{
"status": "affected",
"version": "= 5.3.4"
},
{
"status": "affected",
"version": "= 5.2.6"
},
{
"status": "affected",
"version": "= 5.1.6"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"configurations": [
{
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"vulnerable": true
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a vulnerability exists in the WPS (Wi-Fi Protected Setup) Enrollee implementation where malformed EAP-WSC packets with truncated payloads can cause integer underflow during fragment length calculation. When processing EAP-Expanded (WSC) messages, the code computes frag_len by subtracting header sizes from the total packet length. If an attacker sends a packet where the EAP Length field covers only the header and flags but omits the expected payload (such as the 2-byte Message Length field when WPS_MSG_FLAG_LEN is set), frag_len becomes negative. This negative value is then implicitly cast to size_t when passed to wpabuf_put_data(), resulting in a very large unsigned value. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7."
},
{
"lang": "es",
"value": "ESF-IDF es el Framework de Desarrollo de Internet de las Cosas (IoT) de Espressif. En las versiones 5.5.2, 5.4.3, 5.3.4, 5.2.6 y 5.1.6, existe una vulnerabilidad en la implementaci\u00f3n de Enrollee de WPS (Wi-Fi Protected Setup) donde paquetes EAP-WSC malformados con cargas \u00fatiles truncadas pueden causar un desbordamiento negativo de enteros (integer underflow) durante el c\u00e1lculo de la longitud del fragmento. Al procesar mensajes EAP-Expanded (WSC), el c\u00f3digo calcula frag_len restando los tama\u00f1os de las cabeceras de la longitud total del paquete. Si un atacante env\u00eda un paquete donde el campo EAP Length cubre solo la cabecera y las banderas (flags) pero omite la carga \u00fatil esperada (como el campo Message Length de 2 bytes cuando WPS_MSG_FLAG_LEN est\u00e1 configurado), frag_len se vuelve negativo. Este valor negativo se convierte impl\u00edcitamente a size_t cuando se pasa a wpabuf_put_data(), lo que resulta en un valor sin signo muy grande. Este problema ha sido parcheado en las versiones 5.5.3, 5.4.4, 5.3.5, 5.2.7 y 5.1.7."
}
],
"id": "CVE-2026-25532",
"lastModified": "2026-06-17T10:24:48.313",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
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"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H",
"version": "3.1"
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"availabilityImpact": "HIGH",
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"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
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"source": "nvd@nist.gov",
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"ssvcV203": [
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"ssvcData": {
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"options": [
{
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},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
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],
"role": "CISA Coordinator",
"timestamp": "2026-02-04T19:24:33.788979Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-04T18:16:09.747",
"references": [
{
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"tags": [
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{
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"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-191"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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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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