CVE-2021-20038 (GCVE-0-2021-20038)
Vulnerability from cvelistv5 – Published: 2021-12-08 09:55 – Updated: 2025-10-21 23:25Summary
A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 14:26 UTC
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://psirt.global.sonicwall.com/vuln-detail/SN… | x_refsource_CONFIRM |
| https://github.com/jbaines-r7/badblood | x_refsource_MISC |
| https://www.rapid7.com/blog/post/2022/01/11/cve-2… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SonicWall | SonicWall SMA100 |
Affected:
10.2.0.8-37sv and earlier
Affected: 10.2.1.1-19sv and earlier Affected: 10.2.1.2-24sv and earlier |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 67c53a1c-8642-48f3-a9f4-ddf6076c8c03
Exploited: Yes
Timestamps
First Seen: 2022-01-28
Asserted: 2022-01-28
Scope
Notes: SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability | Affected: SonicWall / SMA 100 Appliances | Description: SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution. | Required action: Apply updates per vendor instructions. | Due date: 2022-02-11 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-20038
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-121 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | SMA 100 Appliances |
| Due Date | 2022-02-11 |
| Date Added | 2022-01-28 |
| Vendorproject | SonicWall |
| Vulnerabilityname | SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-10-02 08:10 CEST
| Updated: 2026-10-02 08:10 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 294e5ad5-0005-48f5-8ffb-b3ac3b5693d9
Exploited: Yes
Timestamps
First Seen: 2022-01-28
Asserted: 2022-01-28
Scope
Notes: A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated... | Affected: SonicWall / SonicWall SMA100 | CVSS: 9.8 (CRITICAL) | EPSS: 0.99912 | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated... |
| Cve Id | CVE-2021-20038 |
| Vendor | SonicWall |
| Ghsa Id | None |
| Product | SonicWall SMA100 |
| Added Date | 2022-01-28T00:00:00.000Z |
| Cvss Score | 9.8 |
| Epss Score | 0.99912 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99966 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2021-20038 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
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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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