CVE-2018-7790
No exploitation reported by the sources we read.
- Published2018-08-29
- Fixed in1.6.2.0
- WeaknessCWE-294
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2018-08-2921:29CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-7790?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-7790?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.6 | < 1.6.2.0 | 1.6.2.0 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Schneider Electric Modicon M221
Modicon M221 all references: all versions prior to firmware v1.6.2.0
Fix
- Update Schneider-electric modicon m221 firmware to 1.6.2.0
- Mitigation from the vendor CISA ICSA-18-240-01 · 1 productA fix for these vulnerabilities is implemented in Modicon M221 Firmware v1.6.2.0, delivered within SoMachine Basic v1.6 SP2, which is available for download below, or by using Schneider Electric Software Update tool
- Mitigation from the vendor CISA ICSA-18-240-01 · 1 productAs a temporary mitigation, Modicon M221 users should take the following measures: Set up a firewall blocking all remote/external access to Port 502.
- Mitigation from the vendor CISA ICSA-18-240-01 · 1 productWithin the Modicon M221 application, users must disable all unused protocols, especially programming protocol, as described in section “Configuring Ethernet Network” of SoMachine Basic online help. This will prevent remote programming of the M221 PLC.
- Mitigation from the vendor CISA ICSA-18-240-01 · 1 productSchneider Electric's security notice SEVD-2018-235-01 is available
Advisories and patches
- www.schneider-electric.comMitigation · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2018-08-29
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2018-7790?
Is CVE-2018-7790 actively exploited?
What is the CVSS score for CVE-2018-7790?
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