CVE Intelligence
High

CVE-2026-4827 — Insufficient Entropy vulnerability on Multiple Products

CWE‑331: Insufficient Entropy vulnerability exists that could lead to unauthorized access when an attacker on the network can exploit weaknesses in session‑management protections.

Published May 12, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: schneider

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.4% (30-day exploitation probability)+5
  • Technical severity (high)+6
  • Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.43%
ahead of 35% of scored CVEs · Oct 14, 2026
Affects
Schneider Electric
Easergy C5 and 13 more
CVSS base
8.7
High · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
Yes
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Schneider Electric Easergy C5, Schneider Electric Easergy MiCOM C264, Schneider Electric Easergy MiCOM P30…).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  4. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
  5. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Schneider Electric Easergy C5 version Version 1.1.17 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric Easergy MiCOM C264 version Versions D6.xversion Versions D7.33 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric Easergy MiCOM P30 version P631 version prior to P631.678.700version C434 version prior to C434.679.700version P638 version prior to P638.677.700version P438 version prior to P438.677.701version P436 version prior to P436.677.701version P138 version prior to P138.677.700version P634 version P634.680.700 onlyversion P633 version P633.680.700 only
and 8 more version P634 version prior to P634.678.700version P633 version prior to P633.678.700version P632 version prior to P632.678.700version P539 version prior to P539.678.700version P532 version prior to P532.678.700version P439 version prior to P439.678.700version P437 version prior to P437.678.700version P139 version prior to P139.678.700
Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric Easergy MiCOM P40 version Series model numbers with Protocol Option bit as G, H or L and all firmware vers Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric EasyLogic T150 (formerly Saitel DR) version Version 11.06.30 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric Ecostruxure Power Operation version Version 2024 CU2 and priorversion Version 2022 CU6 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric EcoStruxure™ Power Automation System Gateway (EPAS-GTW) version Version 6.4.616.200.100 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric EcoStruxure™ Power Automation System User Interface (EPAS-UI) version Version 3.0.3 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric iPMFLS version Version 64.2025.0.13 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric PowerLogic™ P5 Protection Relay version V02.502.103 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric PowerLogic™ P7 Protection and Control Platform version V02.002.002 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric PowerLogic™ T300 version Version 2.9.4 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric PowerLogic™ T500 version Version 11.08.02 and prior Vulnerable CVE Program (cve.org) e CISA ADP
Schneider Electric Saitel DP version Version 11.06.36 and prior Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Attack requirements
None
Privileges required
None
User interaction
Passive
Scope
X
Confidentiality (vulnerable system)
High
Integrity (vulnerable system)
High
Availability (vulnerable system)
Low
Confidentiality (subsequent)
None
Integrity (subsequent)
None
Availability (subsequent)
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
8.7 CVSS 4.0 High — — cybersecurity@se.com via NIST National Vulnerability Database
8.7 CVSS 4.0 High — — schneider via CVE Program (cve.org) e CISA ADP
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X (score shown at the top: cybersecurity@se.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-331

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.43%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · schneider electric/easergy micom c264, schneider electric/easergy c5, schneider electric/easergy micom p30, schneider el
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • CVSS changed · 8.7
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Awaiting Analysis
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVE published
    May 12, 2026 · schneider

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

Elsewhere on this site

Schneider Electric
every CVE for this vendor
CWE-331
other pages naming this weakness

Related CVEs (same products)

  • CVE-2025-11739 Deserialization of Untrusted Data in Schneider Electric Ecostruxure Power Monitoring Expert Mar 10, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-4827 is "Insufficient Entropy vulnerability on Multiple Products", rated High. It affects Easergy C5 (Schneider Electric); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.7 describes technical severity. EPSS 0.43% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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