VulnerabilityModified
CVE-2020-22552
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.
HIGH 7.5EPSS 1.47%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.47% probability · 72th percentile
- CISA KEV
- Not listed
- Affected
- snap7 project/snap7
- Source
- cve@mitre.org
References
- https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/Third Party Advisory
- https://sourceforge.net/projects/snap7/Exploit, Third Party Advisory
- https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/Third Party Advisory
- https://sourceforge.net/projects/snap7/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.