What is the CVSS score of CVE-2019-16863?

CVE-2019-16863 has a CVSS 3.1 base score of 5.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 3.3%.

St CVE-2019-16863

MEDIUM

Observable Discrepancy (CWE-203)

2019-11-14 cve@mitre.org

Information Disclosure St St33Tphf2Espi Firmware St33Tphf2Ei2C Firmware St33Tphf20Spi Firmware St33Tphf20I2C Firmware

5.9

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-203 ASVS 5.0 V6 - Authentication Timing-safe comparisons
Impact	CVSS score of 5.9 (MEDIUM). Attack characteristics: network attack vector, high complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 3.3% exploitation probability (EPSS)

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AnalysisAI

STMicroelectronics ST33TPHF2ESPI TPM devices before 2019-09-12 allow attackers to extract the ECDSA private key via a side-channel timing attack because ECDSA scalar multiplication is mishandled, aka. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

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Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-203. STMicroelectronics ST33TPHF2ESPI TPM devices before 2019-09-12 allow attackers to extract the ECDSA private key via a side-channel timing attack because ECDSA scalar multiplication is mishandled, aka TPM-FAIL. Affected products include: St St33Tphf2Espi Firmware, St St33Tphf2Ei2C Firmware, St St33Tphf20Spi Firmware, St St33Tphf20I2C Firmware. Version information: before 2019.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.9 MEDIUM

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionNVD

Threat Intelligence Overview

EPSS Score

3.3%

Top 13% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 3.3%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +3

CVSS: +30

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:o:st:st33tphf2espi_firmware:71.0:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf2espi_firmware:71.4:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf2espi_firmware:71.12:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf2espi_firmware:73.0:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf2espi_firmware:73.4:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf2espi_firmware:73.8:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf2ei2c_firmware:73.5:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf2ei2c_firmware:73.9:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf20spi_firmware:74.0:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf20spi_firmware:74.4:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf20spi_firmware:74.8:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf20spi_firmware:74.16:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf20i2c_firmware:74.5:*:*:*:*:*:*:*

cpe:2.3:o:st:st33tphf20i2c_firmware:74.9:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://www.st.com/content/st_com/en/campaigns/tpm-update.html REF http://tpm.fail REF https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190024 REF https://support.f5.com/csp/article/K32412503?utm_source=f5support&amp%3Butm_medium=RSS REF https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03972en_us REF https://support.lenovo.com/us/en/product_security/LEN-29406

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