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Fencer Vulns
critical 9.0

CVE-2017-2684 json

Siemens SIMATIC Logon prior to V1.5 SP3 Update 2 could allow an attacker with knowledge of a valid user name, and physical or network acces…

published 2017-02-22 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-11827

cvss
9.0
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

Siemens SIMATIC Logon prior to V1.5 SP3 Update 2 could allow an attacker with knowledge of a valid user name, and physical or network access to the affected system, to bypass the application-level authentication.

Vendor advisories

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

cisa ICSA-17-045-03 updated cvss 9.0

ICSA-17-045-03 Siemens SIMATIC Authentication Bypass (Update D)

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

Exploit prediction

1.99% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.0 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • n/a SIMATIC Logon All versions < V1.5 SP3 Update 2

Classification

Weakness
  • CWE-592 DEPRECATED: Authentication Bypass Issues

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.