FKIE_CVE-2020-1917
Vulnerability from fkie_nvd - Published: 2021-03-10 16:15 - Updated: 2026-06-17 03:02
Severity
Summary
xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not using its standard append char function. As a result, if the buffer was full, it would result in an out-of-bounds write. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.
References
| URL | Tags | ||
|---|---|---|---|
| cve-assign@fb.com | https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca | Patch, Third Party Advisory | |
| cve-assign@fb.com | https://hhvm.com/blog/2021/02/25/security-update.html | Release Notes, Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca | Patch, Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://hhvm.com/blog/2021/02/25/security-update.html | Release Notes, Vendor Advisory |
{
"affected": [
{
"affectedData": [
{
"product": "HHVM",
"vendor": "Facebook",
"versions": [
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.98.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.98.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.97.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.97.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.96.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.96.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.95.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.95.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.94.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.94.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.93.2",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "affected",
"version": "4.81.0",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.80.2",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "affected",
"version": "4.57.0",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.56.3",
"versionType": "custom"
},
{
"lessThan": "4.56.3",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
],
"source": "cve-assign@fb.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
"matchCriteriaId": "069C0B7D-5233-4EFF-BBA7-8B84D9227044",
"versionEndExcluding": "4.56.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
"matchCriteriaId": "59DAD37C-9F51-4BE3-B045-537CA259F7F7",
"versionEndExcluding": "4.80.2",
"versionStartIncluding": "4.57.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
"matchCriteriaId": "3B78720F-AA79-459F-A66C-5C4D67D7EE31",
"versionEndExcluding": "4.93.2",
"versionStartIncluding": "4.81.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.94.0:*:*:*:*:*:*:*",
"matchCriteriaId": "1C4B9A3C-6A5A-45C4-A490-C13CF6D6A867",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.95.0:*:*:*:*:*:*:*",
"matchCriteriaId": "18D33DC0-E6A7-4DC6-8E9A-2B85842EC21B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.96.0:*:*:*:*:*:*:*",
"matchCriteriaId": "B0B9078D-3C25-45B2-B5F2-59585A47BACB",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.97.0:*:*:*:*:*:*:*",
"matchCriteriaId": "7B8F5C11-8610-4099-8A45-E6241F3D24E0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.98.0:*:*:*:*:*:*:*",
"matchCriteriaId": "47FF13C3-19DC-4F53-BF9D-38AC89D647D5",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not using its standard append char function. As a result, if the buffer was full, it would result in an out-of-bounds write. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0."
},
{
"lang": "es",
"value": "La funci\u00f3n xbuf_format_converter, usada como parte de exif_read_data, estaba agregando un car\u00e1cter null de terminaci\u00f3n a la cadena generada, pero no estaba usando su funci\u00f3n est\u00e1ndar append char.\u0026#xa0;Como resultado, si el b\u00fafer estuviera lleno, resultar\u00eda en una escritura fuera de l\u00edmites.\u0026#xa0;Este problema afecta HHVM versiones anteriores a 4.56.3, todas las versiones entre 4.57.0 y 4.80.1, todas las versiones entre 4.81.0 y 4.93.1 y las versiones 4.94.0, 4.95.0, 4.96.0, 4.97.0 , 4.98.0"
}
],
"id": "CVE-2020-1917",
"lastModified": "2026-06-17T03:02:36.680",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 7.5,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 6.4,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-03-10T16:15:14.313",
"references": [
{
"source": "cve-assign@fb.com",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca"
},
{
"source": "cve-assign@fb.com",
"tags": [
"Release Notes",
"Vendor Advisory"
],
"url": "https://hhvm.com/blog/2021/02/25/security-update.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Release Notes",
"Vendor Advisory"
],
"url": "https://hhvm.com/blog/2021/02/25/security-update.html"
}
],
"sourceIdentifier": "cve-assign@fb.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-122"
}
],
"source": "cve-assign@fb.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-787"
}
],
"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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