How severe is CVE-2022-27640?

CVE-2022-27640 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-27640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-27640?

CVE-2022-27640 primarily affects Siemens Simatic Cp 442-1 Rna Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-27640?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-27640 published?

CVE-2022-27640 was published on 2022-05-20 and last updated on 2026-06-17.

CVE-2022-27640

CVE-2022-27640 is a medium-severity vulnerability in Siemens Simatic Cp 442-1 Rna Firmware with a CVSS 3.x base score of 6.5. 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: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.1
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Siemens Simatic Cp 442-1 Rna Firmware
Published: 2022-05-20
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIMATIC CP 442-1 RNA (All versions < V1.5.18), SIMATIC CP 443-1 RNA (All versions < V1.5.18). The affected devices improperly handles excessive ARP broadcast requests. This could allow an attacker to create a denial of service condition by performing ARP storming attacks, which can cause the device to reboot.

Frequently asked questions

What is CVE-2022-27640?: A vulnerability has been identified in SIMATIC CP 442-1 RNA (All versions < V1.5.18), SIMATIC CP 443-1 RNA (All versions < V1.5.18). The affected devices improperly handles excessive ARP broadcast requests. This could allow an attacker to create a denial of service condition by performing ARP storming attacks, which can cause the device to reboot.
How severe is CVE-2022-27640?: CVE-2022-27640 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2022-27640 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-27640?: CVE-2022-27640 primarily affects Siemens Simatic Cp 442-1 Rna Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-27640?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-27640 published?: CVE-2022-27640 was published on 2022-05-20 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-480937.pdf

Affected products (2)

cpe:2.3:o:siemens:simatic_cp_442-1_rna_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_cp_443-1_rna_firmware:*:*:*:*:*:*:*:*

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