CVE-2017-6026

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 32%CVSS: 9.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and are shared between several users. This may allow a current session to be compromised.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
61(Track*)
EG Risk 61/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
32%
EPSS %ILE
98%
KEV
Not listed

Published

June 30, 2017

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated May 19, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Schneider Electric PLC - Session Calculation Authentication Bypass - Hardware webapps Exploit

https://www.exploit-db.com/exploits/45918/
generic
http://www.securityfocus.com/bid/97254

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 14:51 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:30 UTCEG score recompute
  4. 2026-07-22 22:09 UTCEG score recompute
  5. 2026-07-22 14:04 UTCEPSS rescore
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  1. 2026-07-01 15:02 UTCEPSS rescore
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  30. 2026-06-05 22:44 UTCEPSS rescore
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  41. 2026-05-29 13:41 UTCEPSS rescore
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  44. 2026-05-27 13:38 UTCEPSS rescore
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  46. 2026-05-26 13:42 UTCEPSS rescore
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  48. 2026-05-26 07:17 UTCEPSS rescore
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  50. 2026-05-22 21:15 UTCEPSS rescore
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  53. 2026-05-22 21:15 UTCEPSS rescore
  54. 2026-05-22 21:15 UTCEPSS rescore
  55. 2026-05-22 12:14 UTCEG score recompute
  56. 2026-05-22 12:14 UTCGHSA enrichment
  57. 2026-05-20 22:37 UTCEPSS rescore
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  60. 2026-05-20 11:21 UTCEPSS rescore
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  62. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-45918
    First seen Nov 30, 2018

    Schneider Electric PLC - Session Calculation Authentication Bypass

    Open source ↗

Frequently asked(5)

What is CVE-2017-6026?
CVE-2017-6026 is a critical vulnerability published on June 30, 2017. A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and…
When was CVE-2017-6026 disclosed?
CVE-2017-6026 was first published in the National Vulnerability Database on June 30, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-6026 actively exploited?
CVE-2017-6026 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32% probability of exploitation in the next 30 days, which ranks it in the top 1.9% of all scored CVEs.
What is the CVSS score of CVE-2017-6026?
CVE-2017-6026 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2017-6026?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-6026, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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