CVE-2022-32166Network attack vector

Denial of service via unsafe minimask comparison

Published Sep 28, 2022 · Updated May 21, 2025

Heap buffer over-read in Open vSwitch 0.90.0 through 2.5.0 allows remote authenticated users to crash the switch via crafted network traffic. The minimask_equal function in lib/flow.c passes a length derived from the first minimask to memcmp before confirming that both maps have equal lengths, so the comparison can read beyond the shorter allocation. Reaching the affected flow-deletion path requires the ability to submit flow-modification operations; a crash is demonstrated, while code execution is not publicly demonstrated.

CVSS severity6.1
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer over-read in Open vSwitch 0.90.0 through 2.5.0 allows remote authenticated users to crash the switch via crafted network traffic. The minimask_equal function in lib/flow.c passes a length derived from the first minimask to memcmp before confirming that both maps have equal lengths, so the comparison can read beyond the shorter allocation. Reaching the affected flow-deletion path requires the ability to submit flow-modification operations; a crash is demonstrated, while code execution is not publicly demonstrated.

The record

CVE
CVE-2022-32166
Published
Sep 28, 2022
Updated
May 21, 2025
Vendor
Open vSwitch Project
Product
Open vSwitch
Classifications
CWE-125, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 28, 2022CVE publishedPublication date reported by the CVE source.
  2. May 21, 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 <=v2.5.0
  2. Affected versionversion=v0.90.0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open vSwitch Project · Open vSwitchversion=unspecified <=v2.5.0; version=v0.90.0 <unspecified

Published CVSS scores

6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
8.8UbuntuCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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