How severe is CVE-2022-33138?

CVE-2022-33138 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 high, integrity none, and availability none.

Is CVE-2022-33138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-33138?

CVE-2022-33138 primarily affects Siemens Simatic Mv540 H Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-33138?

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-2022-33138 published?

CVE-2022-33138 was published on 2022-07-12 and last updated on 2026-06-17.

CVE-2022-33138

CVE-2022-33138 is a high-severity vulnerability in Siemens Simatic Mv540 H 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-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Siemens Simatic Mv540 H Firmware
Published: 2022-07-12
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S (All versions < V3.3), SIMATIC MV550 H (All versions < V3.3), SIMATIC MV550 S (All versions < V3.3), SIMATIC MV560 U (All versions < V3.3), SIMATIC MV560 X (All versions < V3.3). Affected devices do not perform authentication for several web API endpoints. This could allow an unauthenticated remote attacker to read and download data from the device.

Frequently asked questions

What is CVE-2022-33138?: A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S (All versions < V3.3), SIMATIC MV550 H (All versions < V3.3), SIMATIC MV550 S (All versions < V3.3), SIMATIC MV560 U (All versions < V3.3), SIMATIC MV560 X (All versions < V3.3). Affected devices do not perform authentication for several web API endpoints. This could allow an unauthenticated remote attacker to read and download data from the device.
How severe is CVE-2022-33138?: CVE-2022-33138 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 high, integrity none, and availability none.
Is CVE-2022-33138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-33138?: CVE-2022-33138 primarily affects Siemens Simatic Mv540 H Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-33138?: 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-2022-33138 published?: CVE-2022-33138 was published on 2022-07-12 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-348662.pdf

Affected products (6)

cpe:2.3:o:siemens:simatic_mv540_h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_mv540_s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_mv550_h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_mv550_s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_mv560_u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_mv560_x_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Siemens Simatic Mv540 H Firmware

CVE-2023-36521 — High (CVSS 8.6): A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions <…
CVE-2022-33137 — High (CVSS 8.0): A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S (All versions < V3.3),…
CVE-2023-35921 — High (CVSS 7.5): A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions <…
CVE-2023-35920 — High (CVSS 7.5): A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions <…

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