CVE-2021-20699 (GCVE-0-2021-20699)
Vulnerability from cvelistv5 – Published: 2021-06-07 13:25 – Updated: 2025-12-08 15:51
VLAI
EPSS
VEX
Summary
Sharp NEC Displays ((UN462A R1.300 and prior to it, UN462VA R1.300 and prior to it, UN492S R1.300 and prior to it, UN492VS R1.300 and prior to it, UN552A R1.300 and prior to it, UN552S R1.300 and prior to it, UN552VS R1.300 and prior to it, UN552 R1.300 and prior to it, UN552V R1.300 and prior to it, UX552S R1.300 and prior to it, UX552 R1.300 and prior to it, V864Q R2.000 and prior to it, C861Q R2.000 and prior to it, P754Q R2.000 and prior to it, V754Q R2.000 and prior to it, C751Q R2.000 and prior to it, V984Q R2.000 and prior to it, C981Q R2.000 and prior to it, P654Q R2.000 and prior to it, V654Q R2.000 and prior to it, C651Q R2.000 and prior to it, V554Q R2.000 and prior to it, P404 R3.200 and prior to it, P484 R3.200 and prior to it, P554 R3.200 and prior to it, V404 R3.200 and prior to it, V484 R3.200 and prior to it, V554 R3.200 and prior to it, V404-T R3.200 and prior to it, V484-T R3.200 and prior to it, V554-T R3.200 and prior to it, C501 R2.000 and prior to it, C551 R2.000 and prior to it, C431 R2.000 and prior to it) allows an attacker a buffer overflow and to execute remote code by sending long parameters that contains specific characters in http request.
Severity
9.8 (Critical)
CWE
- Improper certificate validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://sharp-displays.jp.sharp/global/support/in… | x_refsource_MISC |
| https://www.sharp-nec-displays.com/global/support… | x_refsource_MISCx_transferred |
Impacted products
34 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Sharp Display Solutions, Ltd. | UN462A |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN462VA |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN492S |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN492VS |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN552A |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN552S |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN552VS |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN552 |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UN552V |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UX552S |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | UX552 |
Affected:
0 , ≤ R1.300
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V864Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | C861Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | P754Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V754Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | C751Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V984Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | C981Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | P654Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V654Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | C651Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V554Q |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | C501 |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | C551 |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | C431 |
Affected:
0 , ≤ R2.000
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | P404 |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | P484 |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | P554 |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V404 |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V484 |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V554 |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V404-T |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V484-T |
Affected:
0 , ≤ R3.201
(custom)
|
guessed | |
| Sharp Display Solutions, Ltd. | V554-T |
Affected:
0 , ≤ R3.201
(custom)
|
guessed |
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"versions": [
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"lessThanOrEqual": "R1.300",
"status": "affected",
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"vendor": "Sharp Display Solutions, Ltd.",
"versions": [
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"status": "affected",
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"versions": [
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"lessThanOrEqual": "R2.000",
"status": "affected",
"version": "0",
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}
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"vendor": "Sharp Display Solutions, Ltd.",
"versions": [
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"lessThanOrEqual": "R2.000",
"status": "affected",
"version": "0",
"versionType": "custom"
}
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"vendor": "Sharp Display Solutions, Ltd.",
"versions": [
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"lessThanOrEqual": "R3.201",
"status": "affected",
"version": "0",
"versionType": "custom"
}
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},
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"versions": [
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"lessThanOrEqual": "R3.201",
"status": "affected",
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"value": "Sharp NEC Displays ((UN462A R1.300 and prior to it, UN462VA R1.300 and prior to it, UN492S R1.300 and prior to it, UN492VS R1.300 and prior to it, UN552A R1.300 and prior to it, UN552S R1.300 and prior to it, UN552VS R1.300 and prior to it, UN552 R1.300 and prior to it, UN552V R1.300 and prior to it, UX552S R1.300 and prior to it, UX552 R1.300 and prior to it, V864Q R2.000 and prior to it, C861Q R2.000 and prior to it, P754Q R2.000 and prior to it, V754Q R2.000 and prior to it, C751Q R2.000 and prior to it, V984Q R2.000 and prior to it, C981Q R2.000 and prior to it, P654Q R2.000 and prior to it, V654Q R2.000 and prior to it, C651Q R2.000 and prior to it, V554Q R2.000 and prior to it, P404 R3.200 and prior to it, P484 R3.200 and prior to it, P554 R3.200 and prior to it, V404 R3.200 and prior to it, V484 R3.200 and prior to it, V554 R3.200 and prior to it, V404-T R3.200 and prior to it, V484-T R3.200 and prior to it, V554-T R3.200 and prior to it, C501 R2.000 and prior to it, C551 R2.000 and prior to it, C431 R2.000 and prior to it) allows an attacker a buffer overflow and to execute remote code by sending long parameters that contains specific characters in http request."
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{
"lang": "es",
"value": "Sharp NEC Displays ((UN462A R1.300 y anteriores, UN462VA R1.300 y anteriores, UN492S R1.300 y anteriores, UN492VS versiones R1.300 y anteriores, UN552A versiones R1.300 y anteriores, UN552S versiones R1.300 y anteriores, UN552VS versiones R1.300 y anteriores, UN552 versiones R1.300 y anteriores, UN552V versiones R1.300 y anteriores, UN552V versiones R1. 300 y anteriores, UX552S versiones R1.300 y anteriores, UX552 versiones R1.300 y anteriores, V864Q versiones R2.000 y anteriores, C861Q versiones R2.000 y anteriores, P754Q versiones R2.000 y anteriores, V754Q versiones R2.000 y anteriores, C751Q versiones R2.000 y anteriores, V984Q versiones R2.000 y anteriores, C981Q versiones R2.000 y anteriores, P654Q versiones R2. 000 y anteriores, V654Q versiones R2.000 y anteriores, C651Q versiones R2.000 y anteriores, V554Q versiones R2.000 y anteriores, P404 versiones R3.200 y anteriores, P484 versiones R3.200 y anteriores, P554 versiones R3.200 y anteriores, V404 versiones R3.200 y anteriores, V484 versiones R3.200 y anteriores, V554 versiones R3.200 y anteriores, V404-T versiones R3. 200 y anteriores, V484-T versiones R3.200 y anteriores, V554-T versiones R3.200 y anteriores, C501 versiones R2.000 y anteriores, C551 versiones R2.000 y anteriores, C431 versiones R2.000 y anteriores) permite a un atacante un desbordamiento de b\u00fafer y ejecutar c\u00f3digo remoto mediante el env\u00edo de par\u00e1metros largos que contienen caracteres espec\u00edficos en la petici\u00f3n http\n"
}
],
"id": "CVE-2021-20699",
"lastModified": "2025-12-08T08:15:49.693",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 10.0,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 10.0,
"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": "2021-06-07T14:15:07.837",
"references": [
{
"source": "psirt-info@cyber.jp.nec.com",
"url": "https://sharp-displays.jp.sharp/global/support/info/A5-1_vulnerability.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://www.sharp-nec-displays.com/global/support/info/A5-1_vulnerability.html"
}
],
"sourceIdentifier": "psirt-info@cyber.jp.nec.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-77"
},
{
"lang": "en",
"value": "CWE-120"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2025-12-08T09:14:16+00:00",
"cve": "CVE-2021-20699",
"id": "CVE-2021-20699",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "CVE-2021-20699",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-20699.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.