CVE-2026-22904Network attack vector

Unauthenticated service crash via oversized cookie parsing

Published Feb 9, 2026 · Updated Feb 9, 2026

Stack buffer overflow in WAGO Industrial Managed Switch 852-1322 and 852-1328 through 2.64 allows remote attackers to crash the web service. The modified lighttpd web interface parses oversized values in multiple cookie fields, including TRACKID, without enforcing the destination stack buffer's length. A crafted HTTP request reaches the parser without authentication; the resulting memory corruption also creates an undocumented remote code-execution path.

CVSS severity9.8
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in WAGO Industrial Managed Switch 852-1322 and 852-1328 through 2.64 allows remote attackers to crash the web service. The modified lighttpd web interface parses oversized values in multiple cookie fields, including TRACKID, without enforcing the destination stack buffer's length. A crafted HTTP request reaches the parser without authentication; the resulting memory corruption also creates an undocumented remote code-execution path.

The record

CVE
CVE-2026-22904
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
WAGO
Product
Industrial Managed Switch 852-1322
Classifications
CWE-121, T1190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 9, 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=0.0.0 <=2.64
  2. Affected versionversion=2.64

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WAGO · Industrial Managed Switch 852-1322version=0.0.0 <=2.64; version=2.64
WAGO · Industrial Managed Switch 852-1328version=0.0.0 <=2.64; version=2.64

Published CVSS scores

9.8CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 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-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application
T1499.004Application or System Exploitation

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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