HOMEVULNERABILITIESCVE-2018-7790
CRITICAL

CVE-2018-7790

CWE-294Published: August 29, 2018· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

An Information Management Error vulnerability exists in Schneider Electric's Modicon M221 product (all references, all versions prior to firmware V1.6.2.0). The vulnerability allows unauthorized users to replay authentication sequences. If an attacker exploits this vulnerability and connects to a Modicon M221, the attacker can upload the original program from the PLC.

NVD Source

Technical Analysis

CVE-2018-7790 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

schneider-electric2 product(s)
modicon m221 firmwaremodicon m221
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://www.securityfocus.com/bid/105182
ADVISORYhttps://www.schneider-electric.com/en/download/document/SEVD-2018-235-01/
ADVISORYhttp://www.securityfocus.com/bid/105182
ADVISORYhttps://www.schneider-electric.com/en/download/document/SEVD-2018-235-01/

All References (4)

→
http://www.securityfocus.com/bid/105182Third Party Advisory · VDB Entry
→
https://www.schneider-electric.com/en/download/document/SEVD-2018-235-01/Mitigation · Vendor Advisory
→
http://www.securityfocus.com/bid/105182Third Party Advisory · VDB Entry
→
https://www.schneider-electric.com/en/download/document/SEVD-2018-235-01/Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2018-7790
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-294
CISA KEVNo
Affected1 vendor(s)
PublishedAug 29, 2018

Related CVEs (CWE-294)

CVE-2025-49752
10.0
CVE-2023-47435
9.8
CVE-2021-38459
9.8
CVE-2026-28564
9.8
CVE-2021-22640
9.8
CVE-2023-0014
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-7790 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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