How severe is CVE-2021-42853?

CVE-2021-42853 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2021-42853 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42853?

CVE-2021-42853 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-2021-42853?

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

When was CVE-2021-42853 published?

CVE-2021-42853 was published on 2022-03-10 and last updated on 2026-06-17.

CVE-2021-42853

CVE-2021-42853 is a critical-severity vulnerability in Riverbed Steelcentral Appinternals Dynamic Sampling Agent with a CVSS 3.x base score of 9.1. 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 7.5
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
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's (DSA) AgentDiagnosticServlet has directory traversal vulnerability at the "/api/appInternals/1.0/agent/diagnostic/logs" API. The affected endpoint does not have any input validation of the user's input that allows a malicious payload to be injected.

Frequently asked questions

What is CVE-2021-42853?: It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent's (DSA) AgentDiagnosticServlet has directory traversal vulnerability at the "/api/appInternals/1.0/agent/diagnostic/logs" API. The affected endpoint does not have any input validation of the user's input that allows a malicious payload to be injected.
How severe is CVE-2021-42853?: CVE-2021-42853 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2021-42853 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42853?: CVE-2021-42853 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-2021-42853?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-42853 published?: CVE-2021-42853 was published on 2022-03-10 and last updated on 2026-06-17.

References

https://aternity.force.com/customersuccess/s/article/Directory-Traversal-Delete-Read-at-AgentDiagnosticServlet-CVE-2021-42853

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-2021-42855 — High (CVSS 7.8): It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent (DSA) uses the ".debug_command.config" file…
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…

All CVEs affecting Riverbed Steelcentral Appinternals Dynamic Sampling Agent →

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