What is the CVSS score of CVE-2014-7840?

CVE-2014-7840 has a CVSS 2.0 base score of 7.5 (High). CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P. EPSS exploitation probability: 2.5%.

Qemu CVE-2014-7840

HIGH

Improper Input Validation (CWE-20)

2014-12-12 secalert@redhat.com

RCE Red Hat Enterprise Linux Desktop Enterprise Linux Eus Enterprise Linux Server Enterprise Linux Server Aus Enterprise Linux Workstation Qemu Virtualization

7.5

CVSS 2.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-20 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V2 - Validation and Business Logic Input validation, allowlisting
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity. EPSS exploitation probability: 2.46%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 2.5% exploitation probability (EPSS)

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AnalysisAI

The host_from_stream_offset function in arch_init.c in QEMU, when loading RAM during migration, allows remote attackers to execute arbitrary code via a crafted (1) offset or (2) length value in. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, low attack complexity. 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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Technical ContextAI · show details

This vulnerability is classified under CWE-20. The host_from_stream_offset function in arch_init.c in QEMU, when loading RAM during migration, allows remote attackers to execute arbitrary code via a crafted (1) offset or (2) length value in savevm data. Affected products include: Qemu, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Confidentiality

Integrity

Availability

DescriptionCVE.org

Threat Intelligence Overview

EPSS Score

2.5%

Top 15% exploitable

Data Quality

3 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 HIGH

CISA KEV No

Public POC No

EPSS 2.5%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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: +2

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)CVE.org

cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

cpe:2.3:a:redhat:virtualization:3.0:*:*:*:*:*:*:*

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References

Advisories & patches

REF http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=0be839a2701369f669532ea5884c15bead1c6e08 REF http://rhn.redhat.com/errata/RHSA-2015-0349.html REF http://rhn.redhat.com/errata/RHSA-2015-0624.html REF http://thread.gmane.org/gmane.comp.emulators.qemu/306117 REF https://bugzilla.redhat.com/show_bug.cgi?id=1163075 REF https://exchange.xforce.ibmcloud.com/vulnerabilities/99194

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