How severe is CVE-2017-12739?

CVE-2017-12739 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-12739 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12739?

CVE-2017-12739 primarily affects Siemens Sm-2556 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-2017-12739?

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-2017-12739 published?

CVE-2017-12739 was published on 2017-11-15 and last updated on 2026-06-17.

CVE-2017-12739

CVE-2017-12739 is a critical-severity vulnerability in Siemens Sm-2556 Firmware with a CVSS 3.x base score of 9.8. 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-1188.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1188
Affected product: Siemens Sm-2556 Firmware
Published: 2017-11-15
Last modified: 2026-06-17

Description

An issue was discovered on Siemens SICAM RTUs SM-2556 COM Modules with the firmware variants ENOS00, ERAC00, ETA2, ETLS00, MODi00, and DNPi00. The integrated web server (port 80/tcp) of the affected devices could allow unauthenticated remote attackers to execute arbitrary code on the affected device.

Frequently asked questions

What is CVE-2017-12739?: An issue was discovered on Siemens SICAM RTUs SM-2556 COM Modules with the firmware variants ENOS00, ERAC00, ETA2, ETLS00, MODi00, and DNPi00. The integrated web server (port 80/tcp) of the affected devices could allow unauthenticated remote attackers to execute arbitrary code on the affected device.
How severe is CVE-2017-12739?: CVE-2017-12739 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-12739 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12739?: CVE-2017-12739 primarily affects Siemens Sm-2556 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-2017-12739?: 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-2017-12739 published?: CVE-2017-12739 was published on 2017-11-15 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:o:siemens:sm-2556_firmware:dnpi00:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sm-2556_firmware:enos00:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sm-2556_firmware:erac00:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sm-2556_firmware:eta2:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sm-2556_firmware:etls00:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sm-2556_firmware:modi00:*:*:*:*:*:*:*

More vulnerabilities in Siemens Sm-2556 Firmware

CVE-2017-12738 — Medium (CVSS 6.1): An issue was discovered on Siemens SICAM RTUs SM-2556 COM Modules with the firmware variants ENOS00, ERAC00, ETA2,…
CVE-2017-12737 — Medium (CVSS 5.3): An issue was discovered on Siemens SICAM RTUs SM-2556 COM Modules with the firmware variants ENOS00, ERAC00, ETA2,…

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