CVE-2021-20039 (GCVE-0-2021-20039)
Vulnerability from cvelistv5 – Published: 2021-12-08 09:55 – Updated: 2025-09-05 17:09Summary
Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.
Severity
8.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-15 14:46 UTC
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://psirt.global.sonicwall.com/vuln-detail/SN… | x_refsource_CONFIRM |
| http://packetstormsecurity.com/files/165563/Sonic… | x_refsource_MISC |
| https://attackerkb.com/topics/9szJhq46lw/cve-2021… | exploit |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| SonicWall | SonicWall SMA100 |
Affected:
9.0.0.11-31sv and earlier
Affected: 10.2.0.8-37sv and earlier Affected: 10.2.1.1-19sv and earlier Affected: 10.2.1.2-24sv and earlier |
guessed |
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0d7febba-34c8-4d8f-801a-10c55e69a1e7
Exploited: Yes
Timestamps
First Seen: 2025-07-16
Asserted: 2025-07-16
Scope
Notes: KEVIntel entry: Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated... | Affected: SonicWall / SonicWall SMA100 | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated... |
| Vendor | SonicWall |
| Product | SonicWall SMA100 |
| Added Date | 2025-07-16T17:25:30.000Z |
| Cvss Score | 8.8 |
| Epss Score | None |
| Cvss Severity | HIGH |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-06-23 11:12 UTC
| Updated: 2026-06-23 11:12 UTC
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"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
"product": "SonicWall SMA100",
"vendor": "SonicWall",
"versions": [
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"status": "affected",
"version": "9.0.0.11-31sv and earlier"
},
{
"status": "affected",
"version": "10.2.0.8-37sv and earlier"
},
{
"status": "affected",
"version": "10.2.1.1-19sv and earlier"
},
{
"status": "affected",
"version": "10.2.1.2-24sv and earlier"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Improper neutralization of special elements in the SMA100 management interface \u0027/cgi-bin/viewcert\u0027 POST http method allows a remote authenticated attacker to inject arbitrary commands as a \u0027nobody\u0027 user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances."
}
],
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"description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)",
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"type": "CWE"
}
]
}
],
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"dateUpdated": "2022-01-13T18:06:20.000Z",
"orgId": "44b2ff79-1416-4492-88bb-ed0da00c7315",
"shortName": "sonicwall"
},
"references": [
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"tags": [
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],
"url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026"
},
{
"tags": [
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],
"url": "http://packetstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.html"
}
],
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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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