9

CVE-2017-2684: siemens simatic_logon DEPRECATED: Authentication Bypass Issues

Modified
Published 22-02-2017Last modified 05-08-2024

Vulnerability summary

CVE-2017-2684 is a critical (CVSS 9.0) DEPRECATED: Authentication Bypass Issues vulnerability in siemens simatic_logon. EPSS estimates a 1.99% chance of exploitation in the next 30 days, higher than 80.6% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.0/10
010
Critical · v3.0 (NVD)
EPSS score
1.99%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 22-02-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.99%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.99% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Siemens1 product

1 vendor · 1 product

References

2 links