CVE-2022-20870Network attack vector

Device reload via malformed MPLS IPv4 packet

Published Oct 10, 2022 · Updated Nov 1, 2024

Denial of service in Cisco IOS XE Software on affected Catalyst switches allows remote attackers to reload devices via malformed IPv4 traffic. The egress MPLS packet-processing function insufficiently validates IPv4 traffic before transmitting a malformed packet through an MPLS-enabled interface. Exploitation requires a vulnerable IOS XE release with MPLS configured and causes an unexpected device reload that interrupts switching service.

CVSS severity8.6
High
EPSS probability0.91%
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 Software on affected Catalyst switches allows remote attackers to reload devices via malformed IPv4 traffic. The egress MPLS packet-processing function insufficiently validates IPv4 traffic before transmitting a malformed packet through an MPLS-enabled interface. Exploitation requires a vulnerable IOS XE release with MPLS configured and causes an unexpected device reload that interrupts switching service.

The record

CVE
CVE-2022-20870
Published
Oct 10, 2022
Updated
Nov 1, 2024
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-130, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 1, 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?

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  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-130Improper Handling of Length Parameter Inconsistency
T1499Endpoint Denial of Service

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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