CVE-2022-20682Network attack vector

Controller crash and reload via crafted mDNS query

Published Apr 15, 2022 · Updated Nov 6, 2024

Denial of service in Cisco IOS XE Wireless Controller Software allows remote attackers to crash and reload controllers via crafted mDNS queries. The CAPWAP processing path inadequately validates incoming packets that encapsulate mDNS queries, causing the controller to crash and reload. The attacker must connect to a wireless network, and exposure requires the default-disabled mDNS gateway to be enabled globally and active on a WLAN.

CVSS severity8.6
High
EPSS probability1.35%
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 Cisco IOS XE Wireless Controller Software allows remote attackers to crash and reload controllers via crafted mDNS queries. The CAPWAP processing path inadequately validates incoming packets that encapsulate mDNS queries, causing the controller to crash and reload. The attacker must connect to a wireless network, and exposure requires the default-disabled mDNS gateway to be enabled globally and active on a WLAN.

The record

CVE
CVE-2022-20682
Published
Apr 15, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-690, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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?

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

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOS XE Softwareversion=n/a

Published CVSS scores

8.6CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-690Unchecked Return Value to NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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