CVE-2022-26649

Unauthenticated device crash via malformed HTTP URI

Published Jul 12, 2022 · Updated Apr 21, 2025

Classic buffer overflow in Siemens SCALANCE X switches before 5.2.6 or 5.5.2 allows remote attackers to crash devices via HTTP GET. The embedded web server fails to validate an incoming request URI before copying it into a fixed-size destination. No authentication or user interaction is required, but the attacker must reach the switch management interface; successful exploitation interrupts switching-device availability.

CVSS severity9.6
Critical
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in Siemens SCALANCE X switches before 5.2.6 or 5.5.2 allows remote attackers to crash devices via HTTP GET. The embedded web server fails to validate an incoming request URI before copying it into a fixed-size destination. No authentication or user interaction is required, but the attacker must reach the switch management interface; successful exploitation interrupts switching-device availability.

The record

CVE
CVE-2022-26649
Published
Jul 12, 2022
Updated
Apr 21, 2025
Vendor
Siemens
Product
SCALANCE X212-2LD
Classifications
CWE-120, T0814
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 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=All versions < V5.2.6

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · SCALANCE X212-2LDversion=All versions < V5.2.6
Siemens · SCALANCE X204IRT PROversion=All versions < V5.5.2
Siemens · SCALANCE X202-2P IRTversion=All versions < V5.5.2
Siemens · SCALANCE X204-2FMversion=All versions < V5.2.6
Siemens · SCALANCE XF204-2version=All versions < V5.2.6
Siemens · SCALANCE X204-2TSversion=All versions < V5.2.6
Siemens · SCALANCE X204-2version=All versions < V5.2.6
Siemens · SCALANCE X206-1version=All versions < V5.2.6
Siemens · SCALANCE X204-2LDversion=All versions < V5.2.6
Siemens · SCALANCE XF204IRTversion=All versions < V5.5.2
Siemens · SCALANCE X206-1LDversion=All versions < V5.2.6
Siemens · SCALANCE X202-2P IRT PROversion=All versions < V5.5.2
Siemens · SCALANCE X204-2LD TSversion=All versions < V5.2.6
Siemens · SCALANCE X204IRTversion=All versions < V5.5.2
Siemens · SCALANCE X202-2IRTversion=All versions < V5.5.2
Siemens · SCALANCE X216version=All versions < V5.2.6
Siemens · SCALANCE XF202-2P IRTversion=All versions < V5.5.2
Siemens · SCALANCE X208PROversion=All versions < V5.2.6
Siemens · SCALANCE X224version=All versions < V5.2.6
Siemens · SCALANCE X208version=All versions < V5.2.6
Siemens · SCALANCE X201-3P IRT PROversion=All versions < V5.5.2
Siemens · SCALANCE XF201-3P IRTversion=All versions < V5.5.2
Siemens · SCALANCE XF208version=All versions < V5.2.6
Siemens · SCALANCE XF204-2BA IRTversion=All versions < V5.5.2
Siemens · SCALANCE XF204version=All versions < V5.2.6
Siemens · SCALANCE X201-3P IRTversion=All versions < V5.5.2
Siemens · SCALANCE XF206-1version=All versions < V5.2.6
Siemens · SCALANCE X200-4P IRTversion=All versions < V5.5.2
Siemens · SCALANCE X212-2version=All versions < V5.2.6

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
9.6Siemens AGCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T0814Denial 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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