CVE-2021-20039
Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 78.7%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 78.75% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- sonicwall/sma 200 firmware · sonicwall/sma 210 firmware · sonicwall/sma 410 firmware · sonicwall/sma 400 firmware · sonicwall/sma 500v firmware
- Source
- PSIRT@sonicwall.com
EPSS 78.7% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://packetstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Vendor Advisory
- http://packetstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Vendor Advisory
- https://attackerkb.com/topics/9szJhq46lw/cve-2021-20039/rapid7-analysis
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.