CVE-2016-3739 (GCVE-0-2016-3739)
Vulnerability from cvelistv5 – Published: 2016-05-20 00:00 – Updated: 2024-08-06 00:03
VLAI
EPSS
VEX
Summary
The (1) mbed_connect_step1 function in lib/vtls/mbedtls.c and (2) polarssl_connect_step1 function in lib/vtls/polarssl.c in cURL and libcurl before 7.49.0, when using SSLv3 or making a TLS connection to a URL that uses a numerical IP address, allow remote attackers to spoof servers via an arbitrary valid certificate.
Severity
5.3 (Medium)
CWE
- n/a
Assigner
References
11 references
Date Public
2016-05-18 00:00
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The (1) mbed_connect_step1 function in lib/vtls/mbedtls.c and (2) polarssl_connect_step1 function in lib/vtls/polarssl.c in cURL and libcurl before 7.49.0, when using SSLv3 or making a TLS connection to a URL that uses a numerical IP address, allow remote attackers to spoof servers via an arbitrary valid certificate."
},
{
"lang": "es",
"value": "Las funciones (1) mbed_connect_step1 en lib/vtls/mbedtls.c y (2) polarssl_connect_step1 en lib/vtls/polarssl.c en cURL y libcurl en versiones anteriores 7.49.0, cuando usan SSLv3 o hacen una conexi\u00f3n TSL a una URL que usa una direcci\u00f3n IP num\u00e9rica, permiten a atacantes remotos enga\u00f1ar a los servidores a trav\u00e9s de un certificado arbitrario v\u00e1lido."
}
],
"id": "CVE-2016-3739",
"lastModified": "2026-05-06T22:30:45.220",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
"accessComplexity": "HIGH",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 2.6,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 4.9,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
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}
],
"cvssMetricV30": [
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"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
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"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
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},
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"source": "nvd@nist.gov",
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},
"published": "2016-05-20T14:59:05.450",
"references": [
{
"source": "secalert@redhat.com",
"url": "http://www.openwall.com/lists/oss-security/2024/03/27/4"
},
{
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{
"description": [
{
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"value": "CWE-20"
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"redhat_vex": {
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"current_release_date": "2026-08-04T21:58:17+00:00",
"cve": "CVE-2016-3739",
"id": "CVE-2016-3739",
"initial_release_date": "2016-05-18T00:00:00+00:00",
"product_status:known_not_affected": "13",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "curl: TLS certificate name check bypass with mbedTLS and PolarSSL",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-3739.json",
"version": "3"
},
"suse_vex": {
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"current_release_date": "2025-02-18T15:45:19Z",
"cve": "CVE-2016-3739",
"id": "CVE-2016-3739",
"initial_release_date": "2023-02-15T05:04:11Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2016-3739",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-3739.json",
"version": "5"
}
}
}
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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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