CVE-2023-24513Network attack vector

Information disclosure via Sfe size-check bypass

Published Apr 12, 2023 · Updated Feb 7, 2025

Buffer over-read in affected Arista CloudEOS releases allows remote attackers to disclose memory through malformed packets sent to Sfe. The Sfe size-check bypass lets later packet processing read beyond a buffer and, with certain options configured, recompute the TCP checksum for DDoS use. Affected releases are 4.26.0 through 4.26.9M, 4.27.0 through 4.27.8M, 4.28.0 through 4.28.5M, and 4.29.0 through 4.29.1F; Sfe must run and is enabled by default.

CVSS severity6.5
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer over-read in affected Arista CloudEOS releases allows remote attackers to disclose memory through malformed packets sent to Sfe. The Sfe size-check bypass lets later packet processing read beyond a buffer and, with certain options configured, recompute the TCP checksum for DDoS use. Affected releases are 4.26.0 through 4.26.9M, 4.27.0 through 4.27.8M, 4.28.0 through 4.28.5M, and 4.29.0 through 4.29.1F; Sfe must run and is enabled by default.

The record

CVE
CVE-2023-24513
Published
Apr 12, 2023
Updated
Feb 7, 2025
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-126, CWE-125, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.26.0 <=4.26.9M
  2. Affected versionversion=4.27.0 <=4.27.8M
  3. Affected versionversion=4.28.0 <=4.28.5M
  4. Affected versionversion=4.29.0 <=4.29.1F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista EOSversion=4.26.0 <=4.26.9M; version=4.27.0 <=4.27.8M; version=4.28.0 <=4.28.5M; version=4.29.0 <=4.29.1F

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5Arista NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

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-126Buffer Over-read
CWE-125Out-of-bounds Read
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo