How severe is CVE-2020-25242?

CVE-2020-25242 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-25242 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-25242?

CVE-2020-25242 primarily affects Siemens Simatic Net Cp 343-1 Advanced Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-25242?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-25242 published?

CVE-2020-25242 was published on 2021-05-12 and last updated on 2026-06-17.

CVE-2020-25242

CVE-2020-25242 is a high-severity vulnerability in Siemens Simatic Net Cp 343-1 Advanced Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Siemens Simatic Net Cp 343-1 Advanced Firmware
Published: 2021-05-12
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIMATIC NET CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Standard (incl. SIPLUS variants) (All versions). Specially crafted packets sent to TCP port 102 could cause a Denial-of-Service condition on the affected devices. A cold restart might be necessary in order to recover.

Frequently asked questions

What is CVE-2020-25242?: A vulnerability has been identified in SIMATIC NET CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Standard (incl. SIPLUS variants) (All versions). Specially crafted packets sent to TCP port 102 could cause a Denial-of-Service condition on the affected devices. A cold restart might be necessary in order to recover.
How severe is CVE-2020-25242?: CVE-2020-25242 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-25242 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-25242?: CVE-2020-25242 primarily affects Siemens Simatic Net Cp 343-1 Advanced Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-25242?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-25242 published?: CVE-2020-25242 was published on 2021-05-12 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:siemens:simatic_net_cp_343-1_advanced_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_net_cp_343-1_lean_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_net_cp_343-1_standard_firmware:*:*:*:*:*:*:*:*

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