CVE-2021-25669A vulnerability has been identified in SCALANCE X200-4P IRT (All versions < 5.5.1), SCALANCE X201-3P IRT (All versions < 5.5.1), SCALANCE…
- 9.8CriticalCVSS base score
- 2.4%Exploitation in 30 daysEPSS · top 16% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By siemens
- 3 months later
· 3 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.4% · top 16% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
Siemens · SCALANCE X200-4P IRT
- affected All versions < 5.5.1
Siemens · SCALANCE X201-3P IRT
- affected All versions < 5.5.1
Siemens · SCALANCE X201-3P IRT PRO
- affected All versions < 5.5.1
- affected All versions < 5.5.1
Siemens · SCALANCE X202-2P IRT (incl. SIPLUS NET variant)
- affected All versions < 5.5.1
Siemens · SCALANCE X202-2P IRT PRO
- affected All versions < 5.5.1
- affected All versions < 5.5.1
Siemens · SCALANCE X204 IRT PRO
- affected All versions < 5.5.1
Siemens · SCALANCE X204-2 (incl. SIPLUS NET variant)
- affected All versions < V5.2.5
- affected All versions < V5.2.5
Siemens · SCALANCE X204-2LD (incl. SIPLUS NET variant)
- affected All versions < V5.2.5
Siemens · SCALANCE X204-2LD TS
- affected All versions < V5.2.5
- affected All versions < V5.2.5
- affected All versions < V5.2.5
- affected All versions < V5.2.5
Siemens · SCALANCE X208 (incl. SIPLUS NET variant)
- affected All versions < V5.2.5
- affected All versions < V5.2.5
Siemens · SCALANCE X212-2 (incl. SIPLUS NET variant)
- affected All versions < V5.2.5
- affected All versions < V5.2.5
- affected All versions < V5.2.5
- affected All versions < V5.2.5
Siemens · SCALANCE XF201-3P IRT
- affected All versions < 5.5.1
Siemens · SCALANCE XF202-2P IRT
- affected All versions < 5.5.1
- affected All versions < V5.2.5
- affected All versions < 5.5.1
Siemens · SCALANCE XF204-2 (incl. SIPLUS NET variant)
- affected All versions < V5.2.5
Siemens · SCALANCE XF204-2BA IRT
- affected All versions < 5.5.1
- affected All versions < V5.2.5
- affected All versions < V5.2.5
References
References1
- https://cert-portal.siemens.com/productcert/pdf/ssa-187092.pdf (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-12561 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-25669)Record last updated .