Home/CVE/A buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated a
CVE

CVE-2021-20045

A buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated a

A buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated attacker to potentially execute code as the 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

CRITICAL · CVSS 9.8 EPSS 0.10551
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 7% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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Affected Products & Versions

5
sonicwall sma 200 firmwareall versions
sonicwall sma 210 firmwareall versions
sonicwall sma 410 firmwareall versions
sonicwall sma 400 firmwareall versions
sonicwall sma 500v firmwareall versions
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Detection Rules (IDS/IPS)

3
et-openET WEB_SERVER SonicWall SMA Unauthenticated Stack Buffer Overflow (CVE-2021-20045) M1web-application-attack
et-openET WEB_SERVER SonicWall SMA Unauthenticated Stack Buffer Overflow (CVE-2021-20045) M2web-application-attack
et-openET WEB_SERVER SonicWall SMA Unauthenticated Heap Buffer Overflow (CVE-2021-20045)web-application-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
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Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · PSIRT@sonicwall.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Dec 2021 · 10:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Vendor Advisory
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