FKIE_CVE-2021-20501
Vulnerability from fkie_nvd - Published: 2021-04-21 12:15 - Updated: 2026-06-17 03:33
Severity
Summary
IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local-domain recipients to the SMTP server, caused by using a non-default configuration. An attacker could exploit this vulnerability to consume unnecessary network bandwidth and disk space, and allow remote attackers to send spam email. IBM X-Force ID: 198056.
References
| URL | Tags | ||
|---|---|---|---|
| psirt@us.ibm.com | https://exchange.xforce.ibmcloud.com/vulnerabilities/198056 | VDB Entry, Vendor Advisory | |
| psirt@us.ibm.com | https://www.ibm.com/support/pages/node/6445505 | Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://exchange.xforce.ibmcloud.com/vulnerabilities/198056 | VDB Entry, Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://www.ibm.com/support/pages/node/6445505 | Vendor Advisory |
{
"affected": [
{
"affectedData": [
{
"product": "i",
"vendor": "IBM",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "affected",
"version": "7.2"
},
{
"status": "affected",
"version": "7.3"
},
{
"status": "affected",
"version": "7.4"
}
]
}
],
"source": "psirt@us.ibm.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:ibm:i:7.1:*:*:*:*:*:*:*",
"matchCriteriaId": "75F0F975-DD09-4851-A536-1B8484715FEE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:ibm:i:7.2:*:*:*:*:*:*:*",
"matchCriteriaId": "BD871157-2BB3-4641-B84E-3EA13D24D35A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:ibm:i:7.3:*:*:*:*:*:*:*",
"matchCriteriaId": "9A49E8C5-7967-42AE-A787-C533D24A63D7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:ibm:i:7.4:*:*:*:*:*:*:*",
"matchCriteriaId": "92D03306-B6C9-403E-99A2-CE9D8DC3B482",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local-domain recipients to the SMTP server, caused by using a non-default configuration. An attacker could exploit this vulnerability to consume unnecessary network bandwidth and disk space, and allow remote attackers to send spam email. IBM X-Force ID: 198056."
},
{
"lang": "es",
"value": "IBM i versiones 7.1, 7.2, 7.3 y 7.4 SMTP, permite a un atacante de red enviar correos electr\u00f3nicos a destinatarios de dominio local inexistentes en el servidor SMTP, debido al uso de una configuraci\u00f3n no predeterminada.\u0026#xa0;Un atacante podr\u00eda explotar esta vulnerabilidad para consumir ancho de banda de red y espacio en disco innecesarios, y permitir a atacantes remotos enviar correo electr\u00f3nico no deseado.\u0026#xa0; IBM X-Force ID: 198056"
}
],
"id": "CVE-2021-20501",
"lastModified": "2026-06-17T03:33:56.270",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 6.4,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 4.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV30": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
"exploitabilityScore": 2.2,
"impactScore": 3.6,
"source": "psirt@us.ibm.com",
"type": "Secondary"
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 4.2,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-04-21T12:15:08.303",
"references": [
{
"source": "psirt@us.ibm.com",
"tags": [
"VDB Entry",
"Vendor Advisory"
],
"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/198056"
},
{
"source": "psirt@us.ibm.com",
"tags": [
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],
"url": "https://www.ibm.com/support/pages/node/6445505"
},
{
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],
"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/198056"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://www.ibm.com/support/pages/node/6445505"
}
],
"sourceIdentifier": "psirt@us.ibm.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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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