CVE-2023-24548

Egress traffic interruption via unchecked VXLAN packet copy

Published Aug 29, 2023 · Updated Sep 30, 2024

Buffer overflow in Arista EOS 4.22.1F through 4.25.0F allows adjacent attackers to stop egress forwarding via malformed VXLAN packets. The hardware forwarding path copies a malformed or truncated tunneled packet without checking its size; Arista does not identify the specific routine or buffer. Exposure requires an affected R3 switch with IP routing, VXLAN, and a routable extended VLAN or VNI configured, and affected ports remain unable to pass traffic.

CVSS severity5.3
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Arista EOS 4.22.1F through 4.25.0F allows adjacent attackers to stop egress forwarding via malformed VXLAN packets. The hardware forwarding path copies a malformed or truncated tunneled packet without checking its size; Arista does not identify the specific routine or buffer. Exposure requires an affected R3 switch with IP routing, VXLAN, and a routable extended VLAN or VNI configured, and affected ports remain unable to pass traffic.

The record

CVE
CVE-2023-24548
Published
Aug 29, 2023
Updated
Sep 30, 2024
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-120, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 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=4.22.1F <=<=4.22.13M
  2. Affected versionversion=4.23.0 <=<=4.23.14M
  3. Affected versionversion=4.24.0 <=<=4.24.11M
  4. Affected versionversion=4.25.0F <==4.25.0F

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista EOSversion=4.22.1F <=<=4.22.13M; version=4.23.0 <=<=4.23.14M; version=4.24.0 <=<=4.24.11M; version=4.25.0F <==4.25.0F

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3Arista NetworksCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input
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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