CVE-2021-20039

HIGH
8.8
CVSS Score
Published: December 8, 2021 at 09:55 AM UTC
Updated: June 17, 2026 at 03:33 AM UTC
11 products affected across 1 vendorSMA 410 FirmwareSMA 210 FirmwareSMA 500V Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 79%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 10.2.0.8-37svv ≤ 10.2.1.1-19svv ≤ 10.2.1.2-24svv ≤ 9.0.0.11-31sv
All versions
All versions
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-78

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