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Fencer Vulns
critical 9.8

CVE-2020-15800 json

A vulnerability has been identified in SCALANCE X-200 switch family (incl.

published 2021-01-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7783

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

A vulnerability has been identified in SCALANCE X-200 switch family (incl. SIPLUS NET variants) (All versions < V5.2.5), SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) (All versions < V5.5.0), SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) (All versions < V4.1.0). The webserver of the affected devices contains a vulnerability that may lead to a heap overflow condition. An attacker could cause this condition on the webserver by sending specially crafted requests. This could stop the webserver temporarily.

Patch / fix

  • siemens scalance_x200-4pirt_firmware 5.5.0
  • siemens scalance_x201-3pirt_firmware 5.5.0
  • siemens scalance_x202-2irt_firmware 5.5.0
  • siemens scalance_x202-2pirt_firmware 5.5.0
  • siemens scalance_x202-2pirt_siplus_net_firmware 5.5.0
  • siemens scalance_x204irt_firmware 5.5.0
  • siemens scalance_xb205-3_firmware 5.2.5
  • siemens scalance_xb205-3ld_firmware 5.2.5
  • siemens scalance_xb208_firmware 5.2.5
  • siemens scalance_xb213-3_firmware 5.2.5
  • siemens scalance_xb213-3ld_firmware 5.2.5
  • siemens scalance_xb216_firmware 5.2.5
  • siemens scalance_xc206-2_firmware 5.2.5
  • siemens scalance_xc206-2g_poe__firmware 5.2.5
  • siemens scalance_xc206-2g_poe_eec_firmware 5.2.5
  • siemens scalance_xc206-2sfp_firmware 5.2.5
  • siemens scalance_xc206-2sfp_eec_firmware 5.2.5
  • siemens scalance_xc206-2sfp_g_firmware 5.2.5
  • siemens scalance_xc206-2sfp_g_(e/ip)_firmware 5.2.5
  • siemens scalance_xc206-2sfp_g_eec_firmware 5.2.5

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-012-05 updated cvss 9.8

Siemens SCALANCE X Products (Update B)

  • Siemens SCALANCE X-200 switch family (incl. SIPLUS NET variants) <V5.2.5
    affected: fixed in V5.2.5, mitigation support.industry.siemens.com
  • Siemens SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) <V5.5.0
    affected: fixed in V5.5.0, mitigation support.industry.siemens.com
  • Siemens SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) <V4.1.0
    affected: fixed in V4.1.0, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.67% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Siemens SCALANCE X-200 switch family (incl. SIPLUS NET variants)
  • Siemens SCALANCE X-200IRT switch family (incl. SIPLUS NET variants)
  • Siemens SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants)

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.