CVE-2021-20038 (GCVE-0-2021-20038)

Vulnerability from cvelistv5 – Published: 2021-12-08 09:55 – Updated: 2025-10-21 23:25
VLAI CISA Previdian
Summary
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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
sonicwall CNA under the mitre root
CNA scorecard D 54/100 over 34 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fb3b99ef-487b-4737-b5c0-6fd93c3d3741

Vulnerability ID: CVE-2021-20038

Status: Confirmed

Status Updated: 2022-01-28 00:00 UTC

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: 2026-02-02 13:25 UTC | Updated: 2026-11-04 13:01 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 181c1989-dc11-444b-a995-34d99b2f3aba

Vulnerability ID: CVE-2021-20038

Status: Confirmed

Status Updated: 2022-01-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-01-28
Asserted: 2022-01-28
Scope
Notes: KEVIntel entry: 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) | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated...
Vendor SonicWall
Product SonicWall SMA100
Added Date 2022-01-28T00:00:00.000Z
Cvss Score 9.8
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC
Show details on NVD website
To clipboard 

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}



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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

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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

JSON
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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    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.