SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2021-33737

A vulnerability has been identified in SIMATIC CP 343-1 (incl.

HIGH 7.5EPSS 1.06%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.06%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 Advanced (All versions < V3.3), SIPLUS NET CP 443-1 (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (All versions < V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.

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
1.06% probability · 63th percentile
CISA KEV
Not listed
Weakness
CWE-119
Affected
siemens/simatic cp 343-1 firmware · siemens/simatic cp 343-1 advanced firmware · siemens/simatic cp 343-1 erpc firmware · siemens/simatic cp 343-1 lean firmware · siemens/simatic cp 443-1 firmware · siemens/simatic cp 443-1 advanced firmware
Source
productcert@siemens.com

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.