How severe is CVE-2021-42855?

CVE-2021-42855 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42855 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42855?

CVE-2021-42855 primarily affects Riverbed Steelcentral Appinternals Dynamic Sampling Agent. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-42855?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-42855 published?

CVE-2021-42855 was published on 2022-03-10 and last updated on 2026-06-17.

CVE-2021-42855

CVE-2021-42855 is a high-severity vulnerability in Riverbed Steelcentral Appinternals Dynamic Sampling Agent with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Riverbed Steelcentral Appinternals Dynamic Sampling Agent
Published: 2022-03-10
Last modified: 2026-06-17

Description

It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent (DSA) uses the ".debug_command.config" file to store a json string that contains a list of IDs and pre-configured commands. The config file is subsequently used by the "/api/appInternals/1.0/agent/configuration" API to map the corresponding ID to a command to be executed.

Frequently asked questions

What is CVE-2021-42855?: It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent (DSA) uses the ".debug_command.config" file to store a json string that contains a list of IDs and pre-configured commands. The config file is subsequently used by the "/api/appInternals/1.0/agent/configuration" API to map the corresponding ID to a command to be executed.
How severe is CVE-2021-42855?: CVE-2021-42855 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42855 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42855?: CVE-2021-42855 primarily affects Riverbed Steelcentral Appinternals Dynamic Sampling Agent. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-42855?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-42855 published?: CVE-2021-42855 was published on 2022-03-10 and last updated on 2026-06-17.

References

https://aternity.force.com/customersuccess/s/article/Local-privilege-escalation-due-to-misconfigured-write-permission-on-debug-command-config-file-CVE-2021-42855

Affected products (2)

cpe:2.3:a:riverbed:steelcentral_appinternals_dynamic_sampling_agent:*:*:*:*:*:*:*:*
cpe:2.3:a:riverbed:steelcentral_appinternals_dynamic_sampling_agent:10.0.0:*:*:*:*:*:*:*

More vulnerabilities in Riverbed Steelcentral Appinternals Dynamic Sampling Agent

CVE-2021-42854 — Critical (CVSS 9.8): It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent's (DSA) PluginServlet has directory…
CVE-2021-42786 — Critical (CVSS 9.8): It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent (DSA) has Remote Code Execution…
CVE-2021-42787 — Critical (CVSS 9.4): It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent's (DSA) AgentConfigurationServlet has…
CVE-2021-42853 — Critical (CVSS 9.1): It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent's (DSA) AgentDiagnosticServlet has…
CVE-2021-42857 — Medium (CVSS 5.3): It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent's (DSA) AgentDaServlet has directory…
CVE-2021-42856 — Medium (CVSS 4.7): It was discovered that the /DsaDataTest endpoint is susceptible to Cross-site scripting (XSS) attack. It was noted that…

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