CVE-2021-20041
published 2021-12-08CVE-2021-20041: An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles…
PriorityP350high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
6.78%
93.2th percentile
An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles resulting in a loop with unreachable exit condition. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.
Affected
19 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| sonicwall | sma_200_firmware | — | — |
| sonicwall | sma_200_firmware | — | — |
| sonicwall | sma_200_firmware | — | — |
| sonicwall | sma_210_firmware | — | — |
| sonicwall | sma_210_firmware | — | — |
| sonicwall | sma_210_firmware | — | — |
| sonicwall | sma_400_firmware | — | — |
| sonicwall | sma_400_firmware | — | — |
| sonicwall | sma_400_firmware | — | — |
| sonicwall | sma_410_firmware | — | — |
| sonicwall | sma_410_firmware | — | — |
| sonicwall | sma_410_firmware | — | — |
| sonicwall | sma_500v_firmware | — | — |
| sonicwall | sma_500v_firmware | — | — |
| sonicwall | sma_500v_firmware | — | — |
| sonicwall | sonicwall_sma100 | — | — |
| sonicwall | sonicwall_sma100 | — | — |
| sonicwall | sonicwall_sma100 | — | — |
| sonicwall | sonicwall_sma100 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.07.8HIGHAV:N/AC:L/Au:N/C:N/I:N/A:C
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Suricata
ET WEB_SERVER SonicWall SMA Unauthenticated sonicfiles CPU Exhaustion (CVE-2021-20041)
suricata·2025-04-14·CVSS 7.5
CVE-2021-20041 [HIGH] ET WEB_SERVER SonicWall SMA Unauthenticated sonicfiles CPU Exhaustion (CVE-2021-20041)
ET WEB_SERVER SonicWall SMA Unauthenticated sonicfiles CPU Exhaustion (CVE-2021-20041)
Rule: alert http any any -> $HOME_NET any (msg:"ET WEB_SERVER SonicWall SMA Unauthenticated sonicfiles CPU Exhaustion (CVE-2021-20041)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/fileshare/sonicfiles/sonicfiles|3f|"; content:"RacNumber|3d|25"; content:"Arg2|3d 2d|elol"; fast_pattern; reference:url,gist.github.com/jbaines-r7/83202be06be86c5677fb357759a05f34; reference:cve,2021-20041; classtype:web-application-attack; sid:2061559; rev:1; metadata:affected_product SonicWall, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_14, cve CVE_2021_20041, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag E
No public exploits indexed.
2021-12-08
Published