CVE-2022-2529Network attack vector

Service interruption via unbounded sFlow object counts

Published Sep 30, 2022 · Updated May 20, 2025

Improper input validation in Cloudflare GoFlow before 3.4.4 allows remote attackers to exhaust memory via malformed sFlow packets. The sFlow decoder trusts packet-supplied sample, flow-record, AS-path, and community counts when allocating slices without UDP-size bounds. Any unauthenticated sender able to reach the sFlow UDP listener can force excessive allocations until the process is killed or service is interrupted.

CVSS severity7.5
High
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Cloudflare GoFlow before 3.4.4 allows remote attackers to exhaust memory via malformed sFlow packets. The sFlow decoder trusts packet-supplied sample, flow-record, AS-path, and community counts when allocating slices without UDP-size bounds. Any unauthenticated sender able to reach the sFlow UDP listener can force excessive allocations until the process is killed or service is interrupted.

The record

CVE
CVE-2022-2529
Published
Sep 30, 2022
Updated
May 20, 2025
Vendor
Cloudflare
Product
GoFlow
Classifications
CWE-20, CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 30, 2022CVE publishedPublication date reported by the CVE source.
  2. May 20, 2025Record 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=unspecified <3.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloudflare · GoFlowversion=unspecified <3.4.4

Published CVSS scores

7.5Cloudflare, Inc.CVSS:3.1/AV:N/AC:L/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-400Uncontrolled Resource Consumption
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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