CVE-2021-35492Public exploitNetwork attack vector

Authenticated management outage via virtual-host file creation

Published Oct 5, 2021 · Updated Aug 4, 2024

Resource exhaustion in Wowza Streaming Engine 4.8.11+5 and earlier allows remote authenticated users to interrupt web management. The historical.jsdata handler creates or appends a roughly 280 KB statistics file for every attacker-selected, nonexistent vhost value without limiting filesystem allocation. A valid session with Virtual Host Monitoring privileges is required; repeated distinct values fill the filesystem, trigger database errors, and leave management unresponsive until resources are manually freed.

CVSS severity6.5
Medium
EPSS probability3.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Wowza Streaming Engine 4.8.11+5 and earlier allows remote authenticated users to interrupt web management. The historical.jsdata handler creates or appends a roughly 280 KB statistics file for every attacker-selected, nonexistent vhost value without limiting filesystem allocation. A valid session with Virtual Host Monitoring privileges is required; repeated distinct values fill the filesystem, trigger database errors, and leave management unresponsive until resources are manually freed.

The record

CVE
CVE-2021-35492
Published
Oct 5, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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