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CVE-2021-25669

CRITICAL
9.8
CVSS Score
Published: April 22, 2021 at 08:42 PM UTC
Updated: June 17, 2026 at 03:42 AM UTC
58 products affected across 1 vendorScalance XF204 FirmwareScalance Xf204-2ba Irt FirmwareScalance XF208 Firmware

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

Description

A vulnerability has been identified in SCALANCE X200-4P IRT (All versions < 5.5.1), SCALANCE X201-3P IRT (All versions < 5.5.1), SCALANCE X201-3P IRT PRO (All versions < 5.5.1), SCALANCE X202-2 IRT (All versions < 5.5.1), SCALANCE X202-2P IRT (incl. SIPLUS NET variant) (All versions < 5.5.1), SCALANCE X202-2P IRT PRO (All versions < 5.5.1), SCALANCE X204 IRT (All versions < 5.5.1), SCALANCE X204 IRT PRO (All versions < 5.5.1), SCALANCE X204-2 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X204-2FM (All versions < V5.2.5), SCALANCE X204-2LD (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X204-2LD TS (All versions < V5.2.5), SCALANCE X204-2TS (All versions < V5.2.5), SCALANCE X206-1 (All versions < V5.2.5), SCALANCE X206-1LD (All versions < V5.2.5), SCALANCE X208 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X208PRO (All versions < V5.2.5), SCALANCE X212-2 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE X212-2LD (All versions < V5.2.5), SCALANCE X216 (All versions < V5.2.5), SCALANCE X224 (All versions < V5.2.5), SCALANCE XF201-3P IRT (All versions < 5.5.1), SCALANCE XF202-2P IRT (All versions < 5.5.1), SCALANCE XF204 (All versions < V5.2.5), SCALANCE XF204 IRT (All versions < 5.5.1), SCALANCE XF204-2 (incl. SIPLUS NET variant) (All versions < V5.2.5), SCALANCE XF204-2BA IRT (All versions < 5.5.1), SCALANCE XF206-1 (All versions < V5.2.5), SCALANCE XF208 (All versions < V5.2.5). Incorrect processing of POST requests in the web server may write out of bounds in stack. An attacker might leverage this to denial-of-service of the device or remote code execution.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Scalance X200-4p Irt Firmware· Siemens
95%
v < 5.5.1
Affected range stops below 5.5.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-x200-4p-irt (same device)
Scalance X201-3p Irt Firmware· Siemens
95%
v < 5.5.1
Affected range stops below 5.5.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-x201-3p-irt (same device)
Scalance X201-3p Irt Pro Firmware· Siemens
95%
v < 5.5.1
Affected range stops below 5.5.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-x201-3p-irt-pro (same device)
Scalance X202-2irt Firmware· Siemens
95%
v < 5.5.1
Affected range stops below 5.5.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-x202-2-irt (same device)
Scalance X202-2p Irt Firmware· Siemens
95%
v < 5.5.1
Affected range stops below 5.5.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-x202-2p-irt (same device)
Scalance X202-2p Irt Pro Firmware· Siemens
95%
v < 5.5.1
Affected range stops below 5.5.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-x202-2p-irt-pro (same device)
Scalance X204-2 Firmware· Siemens
95%
v < 5.2.5
Affected range stops below 5.2.5, so it looks safe — our inference, not a vendor statement
siemens-scalance-x204-2 (same device)
Scalance X204-2fm Firmware· Siemens
95%
v < 5.2.5
Affected range stops below 5.2.5, so it looks safe — our inference, not a vendor statement
siemens-scalance-x204-2fm (same device)
Scalance X204-2ld Firmware· Siemens
95%
v < 5.2.5
Affected range stops below 5.2.5, so it looks safe — our inference, not a vendor statement
siemens-scalance-x204-2ld (same device)
Scalance X204-2ld Ts Firmware· Siemens
95%
v < 5.2.5
Affected range stops below 5.2.5, so it looks safe — our inference, not a vendor statement
siemens-scalance-x204-2ld-ts (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-187092.pdf

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-121CWE-787

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