Home/CVE/A Heap-based buffer overflow vulnerability in SonicWall SMA100 getBookmarks method allows a remote authenticated attacke
CVE

CVE-2021-20043

A Heap-based buffer overflow vulnerability in SonicWall SMA100 getBookmarks method allows a remote authenticated attacke

A Heap-based buffer overflow vulnerability in SonicWall SMA100 getBookmarks method allows a remote authenticated attacker to potentially execute code as the nobody user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

HIGH · CVSS 8.8 EPSS 0.05755
Schedule remediation
  • EPSS percentile: top 9% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
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Weakness Classification

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
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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)

2
et-openET EXPLOIT SonicWall SMA 100 Series - Possible Heap-Based Overflow Activity (CVE-2021-20043)attempted-admin
et-openET WEB_SERVER SonicWall SMA Heap-Based Buffer Overflow (CVE-2021-20043)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

8.8
HIGH · 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:L/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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