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Fencer Vulns
high 7.5

CVE-2021-40368 json

A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATI…

published 2022-04-12 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27546

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 414-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 414F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416-2 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416F-2 DP V7 (All versions), SIMATIC S7-400 CPU 416F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 417-4 DP V7 (All versions), SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) (All versions < V6.0.10), SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) (All versions < V10.1), SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants) (All versions < V8.2.3), SIPLUS S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 V7 (All versions), SIPLUS S7-400 CPU 417-4 V7 (All versions). Affected devices improperly handle specially crafted packets sent to port 102/tcp.

This could allow an attacker to create a Denial-of-Service condition. A restart is needed to restore normal operations.

Patch / fix

  • siemens simatic_s7-400h_v6_firmware 6.0.10
  • siemens simatic_s7-410_v10_firmware 10.1

Vendor advisories

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

cisa ICSA-22-104-12 updated cvss 7.5

Siemens SIMATIC S7-400

  • Siemens SIMATIC S7-400 CPU 412-1 DP V7 (6ES7412-1XJ07-0AB0) Siemens SIMATIC S7-400 CPU 412-2 DP V7 (6ES7412-2XK07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 412-2 PN/DP V7 (6ES7412-2EK07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-400 CPU 414-2 DP V7 (6ES7414-2XL07-0AB0) Siemens SIMATIC S7-400 CPU 414-3 DP V7 (6ES7414-3XM07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 414-3 PN/DP V7 (6ES7414-3EM07-0AB0) < V7.0.3 Siemens SIMATIC S7-400 CPU 414F-3 PN/DP V7 (6ES7414-3FM07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-400 CPU 416-2 DP V7 (6ES7416-2XP07-0AB0) Siemens SIMATIC S7-400 CPU 416-3 DP V7 (6ES7416-3XS07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 416-3 PN/DP V7 (6ES7416-3ES07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-400 CPU 416F-2 DP V7 (6ES7416-2FP07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 416F-3 PN/DP V7 (6ES7416-3FS07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
show 6 more
  • Siemens SIMATIC S7-400 CPU 417-4 DP V7 (6ES7417-4XT07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) < V6.0.10
    affected: fixed in V6.0.10, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants) < V8.2.3
    affected: fixed in V8.2.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) < V10.1
    affected: fixed in V10.1, mitigation
  • Siemens SIPLUS S7-400 CPU 414-3 PN/DP V7 (6AG1414-3EM07-7AB0) < V7.0.3 Siemens SIPLUS S7-400 CPU 416-3 PN/DP V7 (6AG1416-3ES07-7AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIPLUS S7-400 CPU 416-3 V7 (6AG1416-3XS07-7AB0) Siemens SIPLUS S7-400 CPU 417-4 V7 (6AG1417-4XT07-7AB0)
    affected: mitigation, no fix planned

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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.00% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Siemens SIMATIC S7-400 CPU 412-1 DP V7
  • Siemens SIMATIC S7-400 CPU 412-2 DP V7
  • Siemens SIMATIC S7-400 CPU 412-2 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 414-2 DP V7
  • Siemens SIMATIC S7-400 CPU 414-3 DP V7
  • Siemens SIMATIC S7-400 CPU 414-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 414F-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 416-2 DP V7
  • Siemens SIMATIC S7-400 CPU 416-3 DP V7
  • Siemens SIMATIC S7-400 CPU 416-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 416F-2 DP V7
  • Siemens SIMATIC S7-400 CPU 416F-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 417-4 DP V7
  • Siemens SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants)
  • Siemens SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants)
  • Siemens SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants)
  • Siemens SIPLUS S7-400 CPU 414-3 PN/DP V7
  • Siemens SIPLUS S7-400 CPU 416-3 PN/DP V7
  • Siemens SIPLUS S7-400 CPU 416-3 V7
  • Siemens SIPLUS S7-400 CPU 417-4 V7

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.