CVE-2022-20625

Adjacent service restart via malformed discovery messages

Published Feb 23, 2022 · Updated Nov 6, 2024

Denial of service in Cisco NX-OS Software allows attackers to restart the Cisco Discovery Protocol service via malicious messages. The service improperly handles a series of crafted Cisco Discovery Protocol messages, causing its process to fail and restart. Access to the same Layer 2 domain is required; repeated process failures can rarely restart the entire device.

CVSS severity4.3
Medium
EPSS probability3.26%
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 NX-OS Software allows attackers to restart the Cisco Discovery Protocol service via malicious messages. The service improperly handles a series of crafted Cisco Discovery Protocol messages, causing its process to fail and restart. Access to the same Layer 2 domain is required; repeated process failures can rarely restart the entire device.

The record

CVE
CVE-2022-20625
Published
Feb 23, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco NX-OS Software
Classifications
CWE-399, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco NX-OS Softwareversion=n/a

Published CVSS scores

4.3CiscoCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
4.3NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.1NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:C

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.

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No observations available

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

Weakness, pattern, technique

CWE-399Resource Management Errors
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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