CVE-2026-25804Network attack vector

Policy-tier bypass via OpenFlow priority overflow

Published Feb 6, 2026 · Updated Feb 6, 2026

Integer overflow in Antrea before 2.3.2 and 2.4.0 through 2.4.2 allows remote authenticated users to override policy tiers. The priorityAssigner.initialOFPriority logic performs tier, policy and rule offset arithmetic in uint16, wrapping calculated OpenFlow priorities and reversing intended rule order. Exploitation requires many Antrea NetworkPolicies with varied priorities; upstream-only Kubernetes NetworkPolicy deployments are unaffected, while affected clusters can allow denied traffic or block allowed traffic.

CVSS severity9.1
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Antrea before 2.3.2 and 2.4.0 through 2.4.2 allows remote authenticated users to override policy tiers. The priorityAssigner.initialOFPriority logic performs tier, policy and rule offset arithmetic in uint16, wrapping calculated OpenFlow priorities and reversing intended rule order. Exploitation requires many Antrea NetworkPolicies with varied priorities; upstream-only Kubernetes NetworkPolicy deployments are unaffected, while affected clusters can allow denied traffic or block allowed traffic.

The record

CVE
CVE-2026-25804
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Antrea
Product
Antrea
Classifications
CWE-287, CWE-770, T1562.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record 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=< 2.3.2
  2. Affected versionversion=>= 2.4.0, < 2.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Antrea · Antreaversion=< 2.3.2; version=>= 2.4.0, < 2.4.3

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
8.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-770Allocation of Resources Without Limits or Throttling
T1562.007Disable or Modify Cloud Firewall

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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