CVE-2024-20467Network attack vector

Device reload via fragmented-packet resource mismanagement

Published Sep 25, 2024 · Updated Sep 25, 2024

Resource management errors in Cisco IOS XE Software 17.12.1 and 17.12.1a allow remote attackers to reload affected network devices. The IPv4 fragmentation reassembly code improperly manages resources while processing specially sized packet fragments. Exploitation is unauthenticated and requires the packets to reach an affected device directly or through a VFR-enabled interface, causing a service interruption while the device reloads.

CVSS severity8.6
High
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource management errors in Cisco IOS XE Software 17.12.1 and 17.12.1a allow remote attackers to reload affected network devices. The IPv4 fragmentation reassembly code improperly manages resources while processing specially sized packet fragments. Exploitation is unauthenticated and requires the packets to reach an affected device directly or through a VFR-enabled interface, causing a service interruption while the device reloads.

The record

CVE
CVE-2024-20467
Published
Sep 25, 2024
Updated
Sep 25, 2024
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-399, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=17.11.99sw
  2. Affected versionversion=17.11.99SW
  3. Affected versionversion=17.12.1
  4. Affected versionversion=17.12.1a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOS XE Softwareversion=17.11.99sw; version=17.11.99SW; version=17.12.1; version=17.12.1a

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-399Resource Management Errors
T1498Network 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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