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Fencer Vulns
high 7.8

CVE-2021-42029 json

A vulnerability has been identified in SIMATIC STEP 7 (TIA Portal) V15 (All versions), SIMATIC STEP 7 (TIA Portal) V16 (All versions < V16…

published 2022-04-12 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29017

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC STEP 7 (TIA Portal) V15 (All versions), SIMATIC STEP 7 (TIA Portal) V16 (All versions < V16 Update 5), SIMATIC STEP 7 (TIA Portal) V17 (All versions < V17 Update 2). An attacker could achieve privilege escalation on the web server of certain devices due to improper access control vulnerability in the engineering system software. The attacker needs to have direct access to the impacted web server.

Patch / fix

  • siemens simatic_step_7 16

Vendor advisories

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

cisa ICSA-22-104-14 updated cvss 6.4

Siemens SIMATIC STEP 7 (TIA Portal)

  • Siemens SIMATIC STEP 7 (TIA Portal) V15
    affected: mitigation, no fix planned
  • Siemens SIMATIC STEP 7 (TIA Portal) V16 <V16_Update_5
    affected: fixed in V16, mitigation support.industry.siemens.com
  • Siemens SIMATIC STEP 7 (TIA Portal) V17 <V17_Update_2
    affected: fixed in V17, 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

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Siemens SIMATIC STEP 7 (TIA Portal) V15
  • Siemens SIMATIC STEP 7 (TIA Portal) V16
  • Siemens SIMATIC STEP 7 (TIA Portal) V17

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.