How severe is CVE-2023-43505?

CVE-2023-43505 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2023-43505 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-43505?

CVE-2023-43505 affects Siemens Comos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-43505?

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

When was CVE-2023-43505 published?

CVE-2023-43505 was published on 2023-11-14 and last updated on 2026-06-17.

CVE-2023-43505

CVE-2023-43505 is a critical-severity vulnerability in Siemens Comos with a CVSS 3.x base score of 9.6. 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-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Siemens Comos
Published: 2023-11-14
Last modified: 2026-06-17

Description

A vulnerability has been identified in COMOS (All versions). The affected application lacks proper access controls in SMB shares. This could allow an attacker to access files that the user should not have access to.

Frequently asked questions

What is CVE-2023-43505?: A vulnerability has been identified in COMOS (All versions). The affected application lacks proper access controls in SMB shares. This could allow an attacker to access files that the user should not have access to.
How severe is CVE-2023-43505?: CVE-2023-43505 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2023-43505 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-43505?: CVE-2023-43505 affects Siemens Comos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-43505?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-43505 published?: CVE-2023-43505 was published on 2023-11-14 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-137900.pdf

Affected products (1)

cpe:2.3:a:siemens:comos:*:*:*:*:*:*:*:*

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