How severe is CVE-2021-35492?

CVE-2021-35492 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-35492 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35492?

CVE-2021-35492 affects Wowza Streaming Engine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35492?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-35492 published?

CVE-2021-35492 was published on 2021-10-05 and last updated on 2026-06-17.

CVE-2021-35492

CVE-2021-35492 is a medium-severity vulnerability in Wowza Streaming Engine with a CVSS 3.x base score of 6.5. 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 3% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Wowza Streaming Engine
Published: 2021-10-05
Last modified: 2026-06-17

Description

Wowza Streaming Engine through 4.8.11+5 could allow an authenticated, remote attacker to exhaust filesystem resources via the /enginemanager/server/vhost/historical.jsdata vhost parameter. This is due to the insufficient management of available filesystem resources. An attacker could exploit this vulnerability through the Virtual Host Monitoring section by requesting random virtual-host historical data and exhausting available filesystem resources. A successful exploit could allow the attacker to cause database errors and cause the device to become unresponsive to web-based management. (Manual intervention is required to free filesystem resources and return the application to an operational state.)

Frequently asked questions

What is CVE-2021-35492?: Wowza Streaming Engine through 4.8.11+5 could allow an authenticated, remote attacker to exhaust filesystem resources via the /enginemanager/server/vhost/historical.jsdata vhost parameter. This is due to the insufficient management of available filesystem resources. An attacker could exploit this vulnerability through the Virtual Host Monitoring section by requesting random virtual-host historical data and exhausting available filesystem resources. A successful exploit could allow the attacker to cause database errors and cause the device to become unresponsive to web-based management. (Manual intervention is required to free filesystem resources and return the application to an operational state.)
How severe is CVE-2021-35492?: CVE-2021-35492 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-35492 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35492?: CVE-2021-35492 affects Wowza Streaming Engine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35492?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-35492 published?: CVE-2021-35492 was published on 2021-10-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wowza:streaming_engine:*:*:*:*:*:*:*:*

More vulnerabilities in Wowza Streaming Engine

CVE-2018-7047 — Critical (CVSS 9.8): An issue was discovered in the MBeans Server in Wowza Streaming Engine before 4.7.1. The file system may be read and…
CVE-2024-52053 — Critical (CVSS 9.6): Stored Cross-Site Scripting in the Manager component of Wowza Streaming Engine below 4.9.1 allows an unauthenticated…
CVE-2018-19365 — Critical (CVSS 9.1): The REST API in Wowza Streaming Engine 4.7.4.01 allows traversal of the directory structure and retrieval of a file via…
CVE-2016-20034 — High (CVSS 8.8): Wowza Streaming Engine 4.5.0 contains a privilege escalation vulnerability that allows authenticated read-only users to…
CVE-2020-9004 — High (CVSS 8.8): A remote authenticated authorization-bypass vulnerability in Wowza Streaming Engine 4.8.0 and earlier allows any…
CVE-2021-35491 — High (CVSS 8.1): A Cross-Site Request Forgery (CSRF) vulnerability in Wowza Streaming Engine through 4.8.11+5 allows a remote attacker…

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