CVE-2026-13491Public exploitNetwork attack vector

Audio-session interruption via sessionless MQTT goodbye

Published Jun 28, 2026 · Updated Jun 28, 2026

Denial of service in Xiaoxia xiaozhi-esp32 2.2.0 through 2.2.6 allows remote attackers to interrupt active audio sessions via MQTT. The MQTT goodbye handler accepts a message with no session_id and schedules CloseAudioChannel(false), which resets the active UDP channel. Exploitation requires MQTT and UDP mode plus a publisher or broker route able to deliver the crafted control message to the device callback.

CVSS severity3.7
Low
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Xiaoxia xiaozhi-esp32 2.2.0 through 2.2.6 allows remote attackers to interrupt active audio sessions via MQTT. The MQTT goodbye handler accepts a message with no session_id and schedules CloseAudioChannel(false), which resets the active UDP channel. Exploitation requires MQTT and UDP mode plus a publisher or broker route able to deliver the crafted control message to the device callback.

The record

CVE
CVE-2026-13491
Published
Jun 28, 2026
Updated
Jun 28, 2026
Vendor
Xiaoxia
Product
xiaozhi-esp32
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.2.0
  2. Affected versionversion=2.2.1
  3. Affected versionversion=2.2.2
  4. Affected versionversion=2.2.3
  5. Affected versionversion=2.2.4
  6. Affected versionversion=2.2.5
  7. Affected versionversion=2.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Xiaoxia · xiaozhi-esp32version=2.2.0; version=2.2.1; version=2.2.2; version=2.2.3; version=2.2.4; version=2.2.5; version=2.2.6

Published CVSS scores

2.9VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
3.7VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
2.6VulDBAV:N/AC:H/Au:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.004Application 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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