The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with…
Priority LOW 36Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed.
Why it matters now
EPSS 0.01473 73rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:snap7_project:snap7:1.4.1:*:*:*:*:*:*:* | 1.4.1 | Vulnerable | Snap7 Project |
- cpe:2.3:a:snap7_project:snap7:1.4.1:*:*:*:*:*:*:* Versions 1.4.1 Vulnerable ·Snap7 Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-22552
- 2026-10-03 Alias added: GHSA-c87p-2q2j-cwwp
References
Sources
- CVE-2020-22552 · CVE Program
- CVE-2020-22552 · NVD
- FIRST EPSS
- GHSA-c87p-2q2j-cwwp · GitHub Advisory Database · CC BY 4.0
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