How severe is CVE-2016-8673?

CVE-2016-8673 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-8673 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-8673?

CVE-2016-8673 primarily affects Siemens Simatic S7 300 Cpu Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-8673?

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-2016-8673 published?

CVE-2016-8673 was published on 2016-11-23 and last updated on 2026-06-17.

CVE-2016-8673

CVE-2016-8673 is a high-severity vulnerability in Siemens Simatic S7 300 Cpu Firmware with a CVSS 3.x base score of 8.8. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Siemens Simatic S7 300 Cpu Firmware
Published: 2016-11-23
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIMATIC CP 343-1 Advanced (incl. SIPLUS NET variant) (All versions < V3.0.53), SIMATIC CP 443-1 Advanced (incl. SIPLUS NET variant) (All versions < V3.2.17), SIMATIC S7-300 PN/DP CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP CPU family (incl. SIPLUS variants) (All versions). The integrated web server at port 80/TCP or port 443/TCP of the affected devices could allow remote attackers to perform actions with the permissions of an authenticated user, provided the targeted user has an active session and is induced to trigger the malicious request.

Frequently asked questions

What is CVE-2016-8673?: A vulnerability has been identified in SIMATIC CP 343-1 Advanced (incl. SIPLUS NET variant) (All versions < V3.0.53), SIMATIC CP 443-1 Advanced (incl. SIPLUS NET variant) (All versions < V3.2.17), SIMATIC S7-300 PN/DP CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP CPU family (incl. SIPLUS variants) (All versions). The integrated web server at port 80/TCP or port 443/TCP of the affected devices could allow remote attackers to perform actions with the permissions of an authenticated user, provided the targeted user has an active session and is induced to trigger the malicious request.
How severe is CVE-2016-8673?: CVE-2016-8673 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-8673 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-8673?: CVE-2016-8673 primarily affects Siemens Simatic S7 300 Cpu Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-8673?: 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-2016-8673 published?: CVE-2016-8673 was published on 2016-11-23 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-603476.pdf

Affected products (4)

cpe:2.3:o:siemens:simatic_s7_300_cpu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_cp_443-1_firmware:-:*:*:*:advanced:*:*:*
cpe:2.3:o:siemens:simatic_cp_343-1_firmware:-:*:*:*:advanced:*:*:*
cpe:2.3:o:siemens:simatic_s7_400_cpu_firmware:-:*:*:*:*:*:*:*

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